[task #14639] Table arithmetic operator to find rows within given region

[Sachin Kumar Singh]

Follow-up Comment #7, task #14639 (project gnuastro):

So essentially I'm given a column with X and Y coordinates(I think they are
represented in spherical coordinates in the fits files as there are MAGNITUDE,
RA, DEC columns in HDU's when I did an `asttable table.fits -i`, right?). But
for now I assume them to be in rectangular coordinates (X,Y). So we are
roughly given data in the  following format:

X_IMG | Y_IMG
-------------
X1    |  Y1
X2    |  Y2
.     |  .
.     |  .

As assuming the coordinates are represented in spherical form, then X and Y
are in same rows. 

Now if the data is as above, then to find the region, I simply have to find
the positions of uppermost and lowermost coordinates and eliminate all other
rows, except the ones within the upper and lower limits. Is that right? Am I
missing something?

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