AFNI program: 3dMean

Usage: 3dMean [options] dset dset ...
Takes the voxel-by-voxel mean of all input datasets;
the main reason is to be faster than 3dcalc.

Options [see 3dcalc -help for more details on these]:
  -verbose    = Print out some information along the way.
  -prefix ppp = Sets the prefix of the output dataset.
  -datum ddd  = Sets the datum of the output dataset.
  -fscale     = Force scaling of the output to the maximum integer range.
  -gscale     = Same as '-fscale', but also forces each output sub-brick to
                  to get the same scaling factor.
  -nscale     = Don't do any scaling on output to byte or short datasets.

  -sqr        = Average the squares, instead of the values.
  -sum        = Just take the sum (don't divide by number of datasets).

N.B.: All input datasets must have the same number of voxels along
       each axis (x,y,z,t).
    * At least 2 input datasets are required.
    * Dataset sub-brick selectors [] are allowed.
    * The output dataset origin, time steps, etc., are taken from the
       first input dataset.