Icelandic 16-electrode Electrohysterogram (EHG) Database

Introduction

Preterm birth is a major health problem and the main cause of mortality and morbidity in new-borns. Studies on the electrohysterogram (EHG) have shown promising results regarding preterm labour prediction. A sixteen electrode recording system in a 4-by-4 configuration on the abdomen can provide information on the propagation of uterine electrical activity.

This database consists of 122 16-electrode EHG recordings performed on 45 pregnant women. The recordings were performed between 2008 and 2010 in Iceland. Pregnancy recordings, defined as recordings performed at antenatal care clinics on participants in the third trimester and not suspected to be in labour, were performed at Akureyri Primary Health Care Centre and Landspitali University Hospital. Labour recordings, defined as measurements performed on participants suspected to be in labour, present in the labour wards and who delivered within 24 hours, were performed at Landspitali University Hospital and Akureyri Hospital. Participants had normal singleton pregnancies and no known risk factors for preterm birth. After each pregnancy recording, the participant was invited to take part in another recording one to two weeks later. The protocol was approved by the National Bioethics Committee in Iceland (VSN 02-006-V4).

The measurements were performed using a sixteen channel multi-purpose physiological signal recorder (Embla A10), most commonly used for investigating sleep disorders. An anti-aliasing filter with a high cut-off frequency of 100 Hz was used but no high pass filter was used. The signal sampling rate was 200 Hz and the signal was digitized to 16 bits. The sixteen monopolar electrode signals were originally stored in the EDF (European Data Format) format by the Somnologica software used to control the Embla A10.

A standardized 4-by-4 electrode EHG recording protocol, using reusable Ag/AgCl electrodes with a 13.0 mm outer diameter and an 8.0 mm inner diameter, were used for the recordings. The distance between electrode centres was 17.5 mm. The electrode numbering scheme, as seen when looking at the abdomen of the participant, can be seen in the figure below (Figure 1).

The desired position on the abdomen was with the third vertical line of electrodes (electrodes 9 to 12) placed on the median axis of the uterus and the 10th-11th pair of electrodes half way between the uterine fundus and pubic symphysis. The navel was avoided by displacing the matrix up or down, whilst staying as close as possible to the desired position. A patient ground electrode and a reference electrode were placed over the iliac crests on either side (sides not standardized). The figure below (Figure 2) shows the electrode positions. The corner electrodes of the 4-by-4 grid are labelled and the black electrodes represent the patient ground and reference electrodes.

A tocodynamometer was attached to the abdomen during recordings. When possible, a support, such as a pillow, was positioned under the right side of the participant to prevent potential aortocaval compression syndrome. During a recording, the researcher (AA) recorded participant movements, equipment manipulation, participant-reported possible contractions and foetal movements, and any other unusual events. The participant and researcher conversed freely during the recordings and no restrictions were placed on the participant in terms of changing position if needed.

The intended duration of a pregnancy recording was one hour (actual average recording time was 61 minutes, range 19-86 minutes) and the intended duration of a labour recording was at least half an hour (actual average recording time was 36 minutes, range 8-64 minutes) but the participant could stop the measurement at any time. The majority of participants were measured repeatedly during the same pregnancy and took part in two to seven recordings. The lowest gestational age was 29 weeks and 5 days (29w5d - pregnancy recording) and the highest gestational age was 41 weeks and 5 days (41w5d - labour recording). A detailed description of the recording protocol can be found in the Scientific Data article.

Database Format

File names in the database are of the form ice###_*type*_*record number*, where ice### is the ID of the participant (e.g. ice001), *type* refers to the type of recording: - p (pregnancy) or l (labour), and *record number* is the number of recording for that particular participant (e.g. 1of3). Each recording has three associated files:

• A scanned tocograph with a manually inserted recording time axis (.jgp file). Each small square represents 30 seconds.
• A binary signal (.dat) file containing the data from the 16 monopolar electrodes.
• A header (.hea) file.

The strings at the end of lines 2-17 in the header files correspond to the signal labels. The signals are labelled with "EHGn" where "n" refers to the relevant electrode number (electrode numbers are not in ascending order). Information from each recording is at the end of the header file and includes:

• Participant ID
• Record number
• Record type (labour, pregnancy)
• Age of participant (years)
• BMI (body mass index) of participant before pregnancy
• BMI of participant at time of recording
• Gravidity (number of times participant has been pregnant, including current pregnancy)
• Parity (previous births after 22 weeks gestation)
• Previous caesarean (Yes, No)
• Placental position
• Gestational age at recording (weeks/days), according to a first trimester ultrasound
• Gestational age at delivery (weeks/days)
• Mode of delivery (Vaginal, Vaginal/Induction, Elective caesarean, Emergency caesarean due to slow progress, Emergency caesarean due to other than slow progress). Vaginal delivery indicates spontaneous onset unless appended with /Induction.
• Synthetic oxytocin use in labour (Yes, No)
• Epidural during labour (Yes, No)
• Comments for recording
• Comments for delivery

For 111 of the recordings, there is also an annotation (.atr) file containing the type and timing of events, added manually using WAVE. The types of event are:

• C - Contraction. Used when the participant feels a contraction or there is a very likely contraction on the tocograph (not always used when there is an obvious contraction on the tocograph).
• (c) - Possible contraction. Used when there is not a very likely contraction but the participant has pressure sensation or a contraction is suspected on the tocograph.
• pm - Participant movement.
• pos - Participant change of position.
• fm - Foetal movement. Used when the participant feels foetal movement.
• em - Equipment manipulation. Used when electrodes are pressed more firmly onto the abdomen if otherwise not explained in the comments.

The database also includes:

• The zip file icelandic16ehgmat.zip that includes MATLAB (.mat) versions of all the signal files along with header files (file names of the form ice###_*type*_*record number*m) and MATLAB (.mat) versions of the annotations (file names of the form ice###_*type*_*record number*m_ann). The MATLAB files contain the absolute raw units (divide by 131.068 to obtain the physical units in mV). Please note that the first sample of a signal file is indexed with 1 in the .mat files but with 0 in the .dat files and so there is an index number discrepancy of one between the two file formats (.mat and .dat).
• RECORDS.txt containing a list of the recordings by record name, with one record name per line.
• info.txt containing the clinical information from each recording (information from the header files excluding comments) along with recording durations and whether or not a recording has a corresponding annotation file.

Usage Notes

The annotations and the tocograph complement each other. Some contractions that are present in the annotations are not obvious on the tocograph and some obvious contractions on the tocograph are not in the annotations. This explains in part why some recordings are without annotations. Noted foetal movement could last for differing amounts of time and participants did not always notify if they felt foetal movement. Sometimes foetal movement can be seen on the tocograph.

There can be differences in when participants start to feel a contraction or foetal movements and so differences in when participants notify about events. Events were therefore occasionally approximated to the nearest whole minute. There are also delays internal to the tocodynamometers. Due to factors such as these, the inserted recording times on the tocographs and the annotation times may be up to +/- 30 seconds from the actual recording or event times.

Even though some pregnancies ended in caesarean, the participant was on occasion already in spontaneous labour. These incidences are explained in the comments sections of the header files. If a recording was close to birth, then the timing of the recording with regard to the birth is in the comments of the header file.

Database Files

 Name                    Last modified      Size  Description
 Parent Directory                             -   
 DOI                     2015-09-21 12:21   20   
 MD5SUMS                 2015-04-16 15:21   25K  
 SHA1SUMS                2015-04-16 15:21   29K  
 SHA256SUMS              2015-04-16 15:22   40K  
 ice001_l_1of1.jpg       2014-12-03 11:19  137K  
 ice002_p_1of3.jpg       2014-12-03 11:19  859K  
 ice002_p_2of3.jpg       2014-12-03 11:19  562K  
 ice002_p_3of3.jpg       2014-12-03 11:19  615K  
 ice003_p_1of2.jpg       2014-12-03 11:19  420K  
 ice003_p_2of2.jpg       2014-12-03 11:19  599K  
 ice004_p_1of1.jpg       2014-12-03 11:19  778K  
 ice005_p_1of3.jpg       2014-12-03 11:19  680K  
 ice005_p_2of3.jpg       2014-12-03 11:19  616K  
 ice005_p_3of3.jpg       2014-12-03 11:19  573K  
 ice006_p_1of2.jpg       2014-12-03 11:19  637K  
 ice006_p_2of2.jpg       2014-12-03 11:19  608K  
 ice007_p_1of3.jpg       2014-12-03 11:19  688K  
 ice007_p_2of3.jpg       2014-12-03 11:19  825K  
 ice007_p_3of3.jpg       2014-12-03 11:19  630K  
 ice008_p_1of4.jpg       2014-12-03 11:19  649K  
 ice008_p_2of4.jpg       2014-12-03 11:19  609K  
 ice008_p_3of4.jpg       2014-12-03 11:19  626K  
 ice008_p_4of4.jpg       2014-12-03 11:19  691K  
 ice009_p_1of2.jpg       2014-12-03 11:19  897K  
 ice009_p_2of2.jpg       2014-12-03 11:19  506K  
 ice010_p_1of3.jpg       2014-12-03 11:19  785K  
 ice010_p_2of3.jpg       2014-12-03 11:19  627K  
 ice010_p_3of3.jpg       2014-12-03 11:19  613K  
 ice011_l_3of3.jpg       2014-12-03 11:19  349K  
 ice011_p_1of3.jpg       2014-12-03 11:19  456K  
 ice011_p_2of3.jpg       2014-12-03 11:19  690K  
 ice012_p_1of4.jpg       2014-12-03 11:19  541K  
 ice012_p_2of4.jpg       2014-12-03 11:19  615K  
 ice012_p_3of4.jpg       2014-12-03 11:19  577K  
 ice012_p_4of4.jpg       2014-12-03 11:19  644K  
 ice013_p_1of3.jpg       2014-12-03 11:19  398K  
 ice013_p_2of3.jpg       2014-12-03 11:19  576K  
 ice013_p_3of3.jpg       2014-12-03 11:19  652K  
 ice014_p_1of3.jpg       2014-12-03 11:19  641K  
 ice014_p_2of3.jpg       2014-12-03 11:19  652K  
 ice014_p_3of3.jpg       2014-12-03 11:19  464K  
 ice015_p_1of1.jpg       2014-12-03 11:19  658K  
 ice016_l_1of1.jpg       2014-12-03 11:19  602K  
 ice017_p_1of3.jpg       2014-12-03 11:19  475K  
 ice017_p_2of3.jpg       2014-12-03 11:19  632K  
 ice017_p_3of3.jpg       2014-12-03 11:19  393K  
 ice018_p_1of1.jpg       2014-12-03 11:19  658K  
 ice019_p_1of1.jpg       2014-12-03 11:19  756K  
 ice020_l_1of1.jpg       2014-12-03 11:19  1.0M  
 ice021_p_1of3.jpg       2014-12-03 11:19  578K  
 ice021_p_2of3.jpg       2014-12-03 11:19  643K  
 ice021_p_3of3.jpg       2014-12-03 11:19  406K  
 ice022_p_1of1.jpg       2014-12-03 11:19  716K  
 ice023_p_1of1.jpg       2014-12-03 11:19  682K  
 ice024_l_1of1.jpg       2014-12-03 11:19  358K  
 ice025_l_1of1.jpg       2014-12-03 11:19  1.4M  
 ice026_p_1of4.jpg       2014-12-03 11:19  1.4M  
 ice026_p_2of4.jpg       2014-12-03 11:19  1.4M  
 ice026_p_3of4.jpg       2014-12-03 11:19  1.5M  
 ice026_p_4of4.jpg       2014-12-03 11:19  1.4M  
 ice027_l_7of7.jpg       2014-12-03 11:19  869K  
 ice027_p_1of7.jpg       2014-12-03 11:19  1.3M  
 ice027_p_2of7.jpg       2014-12-03 11:19  1.4M  
 ice027_p_3of7.jpg       2014-12-03 11:19  1.0M  
 ice027_p_4of7.jpg       2014-12-03 11:19  914K  
 ice027_p_5of7.jpg       2014-12-03 11:19  1.1M  
 ice027_p_6of7.jpg       2014-12-03 11:19  1.3M  
 ice028_p_1of3.jpg       2014-12-03 11:19  1.4M  
 ice028_p_2of3.jpg       2014-12-03 11:19  213K  
 ice028_p_3of3.jpg       2014-12-03 11:19  1.6M  
 ice029_p_1of2.jpg       2014-12-03 11:19  683K  
 ice029_p_2of2.jpg       2014-12-03 11:19  772K  
 ice030_l_4of4.jpg       2014-12-03 11:19  498K  
 ice030_p_1of4.jpg       2014-12-03 11:19  839K  
 ice030_p_2of4.jpg       2014-12-03 11:19  823K  
 ice030_p_3of4.jpg       2014-12-03 11:19  686K  
 ice031_l_3of3.jpg       2014-12-03 11:19  820K  
 ice031_p_1of3.jpg       2014-12-03 11:19  1.0M  
 ice031_p_2of3.jpg       2014-12-03 11:19  1.0M  
 ice032_p_1of5.jpg       2014-12-03 11:19  865K  
 ice032_p_2of5.jpg       2014-12-03 11:19  1.7M  
 ice032_p_3of5.jpg       2014-12-03 11:19  1.9M  
 ice032_p_4of5.jpg       2014-12-03 11:19  1.6M  
 ice032_p_5of5.jpg       2014-12-03 11:19  1.6M  
 ice033_p_1of1.jpg       2014-12-03 11:19  1.7M  
 ice034_l_5of5.jpg       2014-12-03 11:19  763K  
 ice034_p_1of5.jpg       2014-12-03 11:19  1.6M  
 ice034_p_2of5.jpg       2014-12-03 11:19  1.3M  
 ice034_p_3of5.jpg       2014-12-03 11:19  229K  
 ice034_p_4of5.jpg       2014-12-03 11:19  1.1M  
 ice035_p_1of3.jpg       2014-12-03 11:19  1.7M  
 ice035_p_2of3.jpg       2014-12-03 11:19  1.7M  
 ice035_p_3of3.jpg       2014-12-03 11:19  1.7M  
 ice036_p_1of6.jpg       2014-12-03 11:19  1.5M  
 ice036_p_2of6.jpg       2014-12-03 11:19  1.6M  
 ice036_p_3of6.jpg       2014-12-03 11:19  1.8M  
 ice036_p_4of6.jpg       2014-12-03 11:19  1.7M  
 ice036_p_5of6.jpg       2014-12-03 11:19  1.1M  
 ice036_p_6of6.jpg       2014-12-03 11:19  1.7M  
 ice037_p_1of2.jpg       2014-12-03 11:19  1.8M  
 ice037_p_2of2.jpg       2014-12-03 11:19  1.1M  
 ice038_p_1of1.jpg       2014-12-03 11:19  1.5M  
 ice039_p_1of6.jpg       2014-12-03 11:19  1.7M  
 ice039_p_2of6.jpg       2014-12-03 11:19  1.6M  
 ice039_p_3of6.jpg       2014-12-03 11:19  1.7M  
 ice039_p_4of6.jpg       2014-12-03 11:19  1.6M  
 ice039_p_5of6.jpg       2014-12-03 11:19  1.6M  
 ice039_p_6aof6.jpg      2014-12-03 11:19  323K  
 ice039_p_6bof6.jpg      2014-12-03 11:19  892K  
 ice040_p_1of5.jpg       2014-12-03 11:19  246K  
 ice040_p_2of5.jpg       2014-12-03 11:19  1.5M  
 ice040_p_3of5.jpg       2014-12-03 11:19  1.6M  
 ice040_p_4of5.jpg       2014-12-03 11:19  1.7M  
 ice040_p_5of5.jpg       2014-12-03 11:19  1.8M  
 ice041_p_1of2.jpg       2014-12-03 11:19  1.7M  
 ice041_p_2of2.jpg       2014-12-03 11:19  1.6M  
 ice042_p_1of2.jpg       2014-12-03 11:19  1.6M  
 ice042_p_2of2.jpg       2014-12-03 11:19  1.1M  
 ice043_p_1of2.jpg       2014-12-03 11:19  1.8M  
 ice043_p_2of2.jpg       2014-12-03 11:19  1.6M  
 ice044_p_1of3.jpg       2014-12-03 11:19  1.8M  
 ice044_p_2of3.jpg       2014-12-03 11:19  1.8M  
 ice044_p_3of3.jpg       2014-12-03 11:19  954K  
 ice045_p_1of4.jpg       2014-12-03 11:19  263K  
 ice045_p_2of4.jpg       2014-12-03 11:19  1.6M  
 ice045_p_3of4.jpg       2014-12-03 11:19  1.6M  
 ice045_p_4of4.jpg       2014-12-03 11:19  1.9M  
 icelandic16ehgmat.zip   2015-04-16 15:02  1.0G  
 info.txt                2015-04-16 15:02   13K  
 ice001_l_1of1.dat       2014-11-26 13:31  3.1M  digitized signal(s)
 ice002_p_1of3.dat       2014-11-26 13:31   25M  digitized signal(s)
 ice002_p_2of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice002_p_3of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice003_p_1of2.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice003_p_2of2.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice004_p_1of1.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice005_p_1of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice005_p_2of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice005_p_3of3.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice006_p_1of2.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice006_p_2of2.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice007_p_1of3.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice007_p_2of3.dat       2014-11-26 13:31   27M  digitized signal(s)
 ice007_p_3of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice008_p_1of4.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice008_p_2of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice008_p_3of4.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice008_p_4of4.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice009_p_1of2.dat       2014-11-26 13:31   31M  digitized signal(s)
 ice009_p_2of2.dat       2014-11-26 13:31   18M  digitized signal(s)
 ice010_p_1of3.dat       2014-11-26 13:31   25M  digitized signal(s)
 ice010_p_2of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice010_p_3of3.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice011_l_3of3.dat       2014-11-26 13:31  9.2M  digitized signal(s)
 ice011_p_1of3.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice011_p_2of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice012_p_1of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice012_p_2of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice012_p_3of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice012_p_4of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice013_p_1of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice013_p_2of3.dat       2014-11-26 13:31   19M  digitized signal(s)
 ice013_p_3of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice014_p_1of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice014_p_2of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice014_p_3of3.dat       2014-11-26 13:31   19M  digitized signal(s)
 ice015_p_1of1.dat       2014-11-26 13:31   27M  digitized signal(s)
 ice016_l_1of1.dat       2014-11-26 13:31   19M  digitized signal(s)
 ice017_p_1of3.dat       2014-11-26 13:31   17M  digitized signal(s)
 ice017_p_2of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice017_p_3of3.dat       2014-11-26 13:31  7.0M  digitized signal(s)
 ice018_p_1of1.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice019_p_1of1.dat       2014-11-26 13:31   20M  digitized signal(s)
 ice020_l_1of1.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice021_p_1of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice021_p_2of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice021_p_3of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice022_p_1of1.dat       2014-11-26 13:31   25M  digitized signal(s)
 ice023_p_1of1.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice024_l_1of1.dat       2014-11-26 13:31  9.3M  digitized signal(s)
 ice025_l_1of1.dat       2014-11-26 13:31   19M  digitized signal(s)
 ice026_p_1of4.dat       2014-11-26 13:31   19M  digitized signal(s)
 ice026_p_2of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice026_p_3of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice026_p_4of4.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice027_l_7of7.dat       2014-11-26 13:31   12M  digitized signal(s)
 ice027_p_1of7.dat       2014-11-26 13:31   21M  digitized signal(s)
 ice027_p_2of7.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice027_p_3of7.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice027_p_4of7.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice027_p_5of7.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice027_p_6of7.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice028_p_1of3.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice028_p_2of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice028_p_3of3.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice029_p_1of2.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice029_p_2of2.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice030_l_4of4.dat       2014-11-26 13:31   12M  digitized signal(s)
 ice030_p_1of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice030_p_2of4.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice030_p_3of4.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice031_l_3of3.dat       2014-11-26 13:31   14M  digitized signal(s)
 ice031_p_1of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice031_p_2of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice032_p_1of5.dat       2014-11-26 13:31   13M  digitized signal(s)
 ice032_p_2of5.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice032_p_3of5.dat       2014-11-26 13:31   25M  digitized signal(s)
 ice032_p_4of5.dat       2014-11-26 13:31   25M  digitized signal(s)
 ice032_p_5of5.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice033_p_1of1.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice034_l_5of5.dat       2014-11-26 13:31   13M  digitized signal(s)
 ice034_p_1of5.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice034_p_2of5.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice034_p_3of5.dat       2014-11-26 13:31   23M  digitized signal(s)
 ice034_p_4of5.dat       2014-11-26 13:31   18M  digitized signal(s)
 ice035_p_1of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice035_p_2of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice035_p_3of3.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice036_p_1of6.dat       2014-11-26 13:31   22M  digitized signal(s)
 ice036_p_2of6.dat       2014-11-26 13:31   21M  digitized signal(s)
 ice036_p_3of6.dat       2014-11-26 13:31   24M  digitized signal(s)
 ice036_p_4of6.dat       2014-11-26 13:31   23M  digitized signal(s)
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 ANNOTATORS              2014-12-22 16:14   30   list of annotators
 RECORDS                 2014-12-22 16:05  1.7K  list of record names
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