Invalid Subframe Selector Keyword

[SeattleStarGazer]

Using SFS for the first time. Entered a weighting expression that I got from a spreadsheet that worked and I entered SFSWEIGHT for the keyword and output the frames. I then registered the frames and tried image integration and got this error message

Error: D:/Astro/Pelican/Registered/Pelican--%2017-07-14--1x1--frame2_c_cc_a_r.xisf: Nonexistent or invalid weight keyword 'SFSWEIGHT'.
<* failed *>

This was the expression

18*((1/(FWHM^2))-0.124861092035111)/0.158072362016496 + 6*(1-(Eccentricity-0.374)/0.411) + 36*(SNRWeight-0.755)/0.081 + 40

I did check the FITS headers and the keyword was there and spelled correctly. Any ideas?

[RickS]

The only times I have had an error like this it has been user error (I ran registration on files in the wrong directory, had an old file lying around, etc.)

Cheers,
Rick.

[mschuster]

Double check that all weights are positive. Zero and negative weights will cause this error.

Also you might want to use a keyword with at most 8 letters. I think this is an official FITS requirement. PI may be able support more, so this might not be the problem.

[RickS]

Double check that all weights are positive. Zero and negative weights will cause this error.

Also you might want to use a keyword with at most 8 letters. I think this is an official FITS requirement. PI may be able support more, so this might not be the problem.

I have used the keyword "SFSWEIGHT" successfully, Mike, but checking for a zero or negative value is a good suggestion.