the sample number at which to start reading the
       record file (default 1 = first sample).


 rawUnits
       A 1x1 integer (default: 1). Returns tm and signal as vectors
       according to the following values:
               rawUnits=1 -returns tm ( millisecond precision only! ) and signal in physical units with 64 bit (double) floating point precision
               rawUnits=2 -returns tm ( millisecond precision only! ) and signal in physical units with 32 bit (single) floating point  precision
    