This file describes the EEP 3.x ERP file format (*.avr).

MPI/ANT (eeprobe@ant-software.nl)
Max-Planck-Institute of Cognitive Neuroscience, Leipzig

$Id$



1. Global Header (first 38 bytes)

  offset             type      value
  -----------------------------------------------------------------------
    0                s16       global header size (always 38)
    2                s16       channel header size (always 16)
    4                s16       nchannels
    6                s16       nsamples
    8                s16       ntrials    (total number of trials)
   10                s16       nrejected  (number of rejected trials)
   12                f32       time in ms for first data point
   16                f32       sample interval
   20                char[10]  condition label
   30                char[8]   color code (see below)

2. Channel Header (16 bytes per channel)

  offset             type      value
  -----------------------------------------------------------------------
    0                char[10]  channel label
   10                u32       file offset for data of this channel
   14                char[2]   unused

3. Data Vectors 
   
  nsamples f32's for the means, nsamples f32's for the variances
  this is repeated nchannels times
  
  set all variance values to 0.0 to indicate "no variance available"


4. avr-file color codes 

  The 8 character color entry holds the string "color:" followed by a number.
  The following numbers are allowed (listed with the assigned EEP color name
  and the assigned X11 color specification):
  
     1, "BLUE",      "rgb:0000/0000/ffff",
     2, "GREEN",     "rgb:0000/ffff/0000",
     3, "CYAN",      "rgb:0000/ffff/ffff",
     4, "RED",       "rgb:ffff/0000/0000",
     5, "MAGENTA",   "rgb:ffff/0000/ffff",
     6, "YELLOW",    "rgb:da00/a500/2000",
     7, "WHITE",     "rgb:7fff/7fff/7fff",
     8, "BLACK",     "rgb:0000/0000/0000",
    16, "BLUE",      "rgb:0000/0000/ffff",
    17, "STEEL",     "rgb:0000/0000/8b00",
    18, "SKY",       "rgb:6c00/a600/cd00",
    19, "CYAN",      "rgb:0000/ffff/ffff",
    20, "MINT",      "rgb:0000/ff00/7f00",
    21, "SEA",       "rgb:8f00/bc00/8f00",
    22, "LEAVES",    "rgb:8b00/8600/4e00",
    23, "GREEN",     "rgb:0000/ffff/0000",
    24, "OLIVE",     "rgb:bc00/ee00/6800",
    25, "SIENNA",    "rgb:a000/5200/2d00",
    26, "LIGHTGREEN","rgb:4300/cd00/8000",
    27, "YELLOW",    "rgb:da00/a500/2000",
    28, "OCHRE",     "rgb:ff00/8200/4700",
    29, "APRICOT",   "rgb:cd00/ad00/0000",
    30, "ORANGE",    "rgb:ff00/8c00/0000",
    31, "RED",       "rgb:ffff/0000/0000",
    32, "CRIMSON",   "rgb:cd00/6600/1d00",
    33, "ROSE",      "rgb:9900/3200/cc00",
    34, "PINK",      "rgb:ff00/1400/9300",
    35, "MAGENTA",   "rgb:ffff/0000/ffff",
    36, "PURPLE",    "rgb:a000/2000/f000",
    37, "LILAC",     "rgb:8a00/2b00/e200",
    38, "AUBERGINE", "rgb:6600/cd00/aa00",
    39, "PLUM",      "rgb:2700/4000/8b00",
    40, "UV",        "rgb:0000/6800/8b00",