Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_datatype_raw”.

  FT_DATATYPE_RAW describes the FieldTrip MATLAB structure for raw data
  The raw datatype represents sensor-level time-domain data typically
  obtained after calling FT_DEFINETRIAL and FT_PREPROCESSING. It contains
  one or multiple segments of data, each represented as Nchan X Ntime
  An example of a raw data structure with 151 MEG channels is
           label: {151x1 cell}      the channel labels (e.g. 'MRC13')
            time: {1x266 cell}      the timeaxis [1*Ntime double] per trial
           trial: {1x266 cell}      the numeric data [151*Ntime double] per trial
      sampleinfo: [266x2 double]    the begin and endsample of each trial relative to the recording on disk
       trialinfo: [266x1 double]    optional trigger or condition codes for each trial
             hdr: [1x1 struct]      the full header information of the original dataset on disk
            grad: [1x1 struct]      information about the sensor array (for EEG it is called elec)
            cfg: [1x1 struct]       the configuration used by the function that generated this data structure
  Required fields:
    - time, trial, label
  Optional fields:
    - sampleinfo, trialinfo, grad, elec, opto, hdr, cfg
  Deprecated fields:
    - fsample
  Obsoleted fields:
    - offset
  Revision history:
  (2011/latest) The description of the sensors has changed, see FT_DATATYPE_SENS
  for further information.
  (2010v2) The trialdef field has been replaced by the sampleinfo and
  trialinfo fields. The sampleinfo corresponds to trl(:,1:2), the trialinfo
  to trl(4:end).
  (2010v1) In 2010/Q3 it shortly contained the trialdef field which was a copy
  of the trial definition (trl) is generated by FT_DEFINETRIAL.
  (2007) It used to contain the offset field, which correcponds to trl(:,3).
  Since the offset field is redundant with the time axis, the offset field is
  from now on not present any more. It can be recreated if needed.
  (2003) The initial version was defined