Panic subsiding (but not gone).
Have modified the reading functions to allow you to use row and column selectors on stdin, as in
1dplot -X stdin'[0]' stdin'[1]'
This will only work as shown above -- that is, the filename is given as "stdin". This feature should work in most, if not all, AFNI places where normal .1D file input is specified.
Since stdin can't be rewound, the way it works is that the first time stdin is read as a 1D file, a copy is kept. If the stdin-reading function is called again, then a copy of the copy is returned. Then the [column] and {row} selectors are applied.