Here is an example:
vtimestep -in infile.v -out outfile.v -step 0
The input into 'vtimestep' is an fMRT data set. It can either be a raw data set or
a processed data set (i.e. processed by 'vpreprocess' or 'vfunctrans').
The output is a single time step represented as a 3D data set. It can be
visualized using 'vlview' .
The parameter '-step' specifies the time step to be selected. Indexing starts
at '0'.
The parameter '-repn' denotes the output representation type. If set to 'ubyte' then it can be easily visualized using 'vlview' or ' 'vlv'.