def _read_epoch(fid):
 out = {'pts_in_epoch': read_int32(fid), 'epoch_duration': read_float(fid), 'expected_iti': read_float(fid), 'actual_iti': read_float(fid), 'total_var_events': read_int32(fid), 'checksum': read_int32(fid), 'epoch_timestamp': read_int32(fid)}
 fid.seek(28, 1)
 return out

def _read_epoch ( fid ) : out = { 'pts_in_epoch' : read_int32 ( fid ) , 'epoch_duration' : read_float ( fid ) , 'expected_iti' : read_float ( fid ) , 'actual_iti' : read_float ( fid ) , 'total_var_events' : read_int32 ( fid ) , 'checksum' : read_int32 ( fid ) , 'epoch_timestamp' : read_int32 ( fid ) } fid . seek ( 28 , 1 ) return out
read bti pdf epoch .