INPUT DATASET NAMES
-------------------
 An input dataset is specified using one of these forms:
    'prefix+view', 'prefix+view.HEAD', or 'prefix+view.BRIK'.
 You can also add a sub-brick selection list after the end of the
 dataset name.  This allows only a subset of the sub-bricks to be
 read in (by default, all of a dataset's sub-bricks are input).
 A sub-brick selection list looks like one of the following forms:
   fred+orig[5]                     ==> use only sub-brick #5
   fred+orig[5,9,17]                ==> use #5, #9, and #17
   fred+orig[5..8]     or [5-8]     ==> use #5, #6, #7, and #8
   fred+orig[5..13(2)] or [5-13(2)] ==> use #5, #7, #9, #11, and #13
 Sub-brick indexes start at 0.  You can use the character '$'
 to indicate the last sub-brick in a dataset; for example, you
 can select every third sub-brick by using the selection list
   fred+orig[0..$(3)]

 N.B.: The sub-bricks are read in the order specified, which may
 not be the order in the original dataset.  For example, using
   fred+orig[0..$(2),1..$(2)]
 will cause the sub-bricks in fred+orig to be input into memory
 in an interleaved fashion.  Using
   fred+orig[$..0]
 will reverse the order of the sub-bricks.

 N.B.: You may also use the syntax <a..b> after the name of an input 
 dataset to restrict the range of values read in to the numerical
 values in a..b, inclusive.  For example,
    fred+orig[5..7]<100..200>
 creates a 3 sub-brick dataset with values less than 100 or
 greater than 200 from the original set to zero.
 If you use the <> sub-range selection without the [] sub-brick
 selection, it is the same as if you had put [0..$] in front of
 the sub-range selection.

 N.B.: Datasets using sub-brick/sub-range selectors are treated as:
  - 3D+time if the dataset is 3D+time and more than 1 brick is chosen
  - otherwise, as bucket datasets (-abuc or -fbuc)
    (in particular, fico, fitt, etc datasets are converted to fbuc!)

 N.B.: The characters '$ ( ) [ ] < >'  are special to the shell,
 so you will have to escape them.  This is most easily done by
 putting the entire dataset plus selection list inside forward
 single quotes, as in 'fred+orig[5..7,9]', or double quotes "x".