File layout is is different than that for the more recent xshear code, so
will need to be adapted.

    ra dec e1 e2 error mag R scinv1 scinv2 ..... scinv21

You could create the weight entry for xshear from the error, which is per
ellipticity component.  These are distortion e1,e2 not reduced shear g1,g2

Note there are 21 columns called scinv* that are inverse critical density
entries for 21 lens redshifts. These are the lens redshifts

[0.02 0.035 0.05 0.065 0.08 0.095 0.11 0.125 0.14 0.155 0.17 0.185 0.2 0.215
 0.23 0.245 0.26 0.275 0.29 0.305 0.32 0.335 0.35 0.365 0.38 0.395 0.41]

Those were generated based on an estimate of the P(z) for each source galaxy.
Those would be used if you were doing a galaxy-galaxy lensing type of
measurement and you knew the lens redshifts, you can interpolate to
get the appropriate inverse critical density.

Note to self: this is a copy of the 08 scat files from the main tree