Level 2 Help for CLABEL

The single input file to "clabel" which must be an expanded contour
file such as would be produced if the program, "polyscrb", operating 
on a graphics file produced by the program, "contour".

A contour in the input contour file with length less than 'minlen'
will not be labeled.

The label, which is taken from the dn in the image corresponding
to the contour, will be transformed by LABEL=TRANS[0]*DN+TRANS[1].

The height of the text in the label in pixels.

The type of font to use in the labels. The font type is
taken from those available in the program, "font".