[daip] Using source models in FRING

[Chris Flatters]

Leonid Kogan (lkogan at aoc.nrao.edu) writes:

> Then FERROR is compared with FTOL. If (FERROR .GE. FTOL) then the frequencies 
> are considered ununiform and the message appears.
> 
> The tollerance TOL=1.E-7 may be too small in comparison with possible mistake 
> of FERROR's calculation by MOD.

I looks as if the tolerance should be 1.0E-7 in the calls to GRDFRQ. This is
close to the expected round-off error in computing the gridding error in
single-precision.

> 
> This is my explanation of this message. If I am right then the message is not 
> dangerous. Having discussed this issue here I'll try to modify the trigger of 
> this message.
> 

It is not dangerous but, as it says, it may indicate some degradation of
results.

	Chris Flatters
	cflatter at nrao.edu