[daip] aips_gripe

[Eric Greisen]

AIPS sign-on writes:
 > {10-JUL-2003 14:20:57}
 > {parallax     UN-REGISTERED!!!!!!!}
 > { 2179  31DEC03  LINX}
 > {Walter Brisken}
 > {NRAO Socorro}
 > {505-835-7133}
 > {UVPLT : plotting Stokes Q, U, or V against anything else
 >  seems to plot only the magnitude of Q, U, or V -- the sign
 >  is clipped, or something funny happens to it.
 >   
 >  It would also be great if Q could be plotted against U.
 >   
 >   }
 > {in UVPLT Stokes Q, U, V are plotted without sign.}
 > {wbrisken at nrao.edu}
 > { }
 > _______________________________________________

Q, U, V are, like I, complex numbers.  They have an amplitude and a
phase and are the FFT of something on the sky.  I suppose under some
circumstances, they may have phases near 0 and 180 and could then be
treated as signed.  But in general they may have any phase.

Eric Greisen