Clears the current intensity selection. Again, you can choose 'all', or last, or give a file list. The files are all named xsel_intensity_gtinnn.xsl.
There is one slightly non-obvious point here: the following sequence
xsel > extract curve xsel > filter intensity 0.5-0.9 xsel > extract all ... xsel > clear intensity xsel > filter intensity 1.0-1.5
will result in all the data being eliminated. The reason is that the clear intensity clears the GTI's, but the next filter intensity acts upon the lightcurve which was produced with these GTI's.
To produce the desired effect, instead do
xsel > extract curve xsel > filter intensity 0.5-0.9 xsel > extract all ... xsel > clear intensity xsel > extract curve xsel > filter intensity 1.0-1.5
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