NB: column filters work on tables only. Regions work on tables and images.
fundisp foo.fits'[circle(512,512,.5)]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   6   7     79493997.45854475  578  574
 512  512   8   9     79494575.58943175  579  573
 512  512   5   6     79493631.03866175  578  575
 512  512   5   5     79493290.86521725  578  575
 512  512   8   9     79493432.00990875  579  573
fundisp foo.fits'[circle 512 512 .5 && pha==5]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   5   6     79493631.03866175  578  575
 512  512   5   5     79493290.86521725  578  575
fundisp foo.fits'[circle(512,512,.5)&&pha=5:6]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   6   7     79493997.45854475  578  574
 512  512   5   6     79493631.03866175  578  575
 512  512   5   5     79493290.86521725  578  575
fundisp foo.fits'[circle(512,512,.5)&&\!pha=5:6]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   8   9     79494575.58943175  579  573
 512  512   8   9     79493432.00990875  579  573
fundisp foo.fits'[circle(512,512,.5); circle 500 500 .1]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 500  500   5   5     79493733.05197725  600  577
 500  500   9   9     79488217.13936825  600  576
 500  500   2   2     79487590.99904275  599  581
 512  512   6   7     79493997.45854475  578  574
 512  512   8   9     79494575.58943175  579  573
 512  512   5   6     79493631.03866175  578  575
 512  512   5   5     79493290.86521725  578  575
 512  512   8   9     79493432.00990875  579  573
fundisp foo.fits'[circle(512,512,.5)&&time==79493631.03866175]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   5   6     79493631.03866175  578  575
fundisp foo.fits'[circle(512,512,.5)&&feq(time,79493631.03866175)]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   5   6     79493631.03866175  578  575
fundisp foo.fits'[circle(512,512,1);-cir 512 512 .5]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  511   9   9     79492909.11908525  580  572
 512  511   6   7     79492607.35239075  580  573
 512  511   6   7     79493574.08603576  580  573
 512  511   7   8     79488537.75487424  579  572
 511  512   5   5     79488781.64644176  579  576
 511  512   5   6     79492586.05470325  579  576
 511  512  10  10     79494397.55842775  580  574
 511  512   1   2     79493697.87522624  577  582
 511  512   6   7     79493997.75123225  579  575
 511  512  10  11     79487417.67703976  579  574
 513  512   6   6     79493306.47509325  578  573
 513  512   8   8     79487909.39373726  578  572
 512  513   4   4     79487403.52010125  576  577
 512  513   8   9     79492536.31151475  577  574
 512  513  10  10     79492589.71195325  578  574
 512  513   5   5     79488335.19512025  576  575
 512  513   8   8     79493661.25728776  578  574
 512  513   8   9     79487914.98186225  577  574
 512  513   5   5     79487392.91247626  577  576
 512  513   4   4     79492808.24789475  577  576
 512  513   7   8     79493236.90765475  577  574
 512  513   6   7     79493667.65710025  578  574
fundisp foo.fits'[circle(512,512,1)&&pha=6:7;-cir 512 512 .5]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  511   6   7     79492607.35239075  580  573
 512  511   6   7     79493574.08603576  580  573
 512  511   7   8     79488537.75487424  579  572
 511  512   6   7     79493997.75123225  579  575
 513  512   6   6     79493306.47509325  578  573
 512  513   7   8     79493236.90765475  577  574
 512  513   6   7     79493667.65710025  578  574
fundisp foo.fits'[circle(512,512,1)&&pha=5:7 && pi=6:8;-cir 512 512 .5]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  511   6   7     79492607.35239075  580  573
 512  511   6   7     79493574.08603576  580  573
 512  511   7   8     79488537.75487424  579  572
 511  512   5   6     79492586.05470325  579  576
 511  512   6   7     79493997.75123225  579  575
 513  512   6   6     79493306.47509325  578  573
 512  513   7   8     79493236.90765475  577  574
 512  513   6   7     79493667.65710025  578  574
fundisp foo.fits'[fk5;circle(345.25391,58.879774,3.9999997")]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   6   7     79493997.45854475  578  574
 512  512   8   9     79494575.58943175  579  573
 512  512   5   6     79493631.03866175  578  575
 512  512   5   5     79493290.86521725  578  575
 512  512   8   9     79493432.00990875  579  573
cat foo.reg
# Region file format: DS9 version 4.0
# Filename: foo.fits'[EVENTS]'
global color=green font="helvetica 10 normal" select=1 highlite=1 edit=1 move=1 delete=1 include=1 fixed=0 source
fk5
circle(345.25391,58.879774,3.9999997")
fundisp foo.fits'[@foo.reg]'
 
   X    Y PHA  PI                  TIME   DX   DY
---- ---- --- --- --------------------- ---- ----
 512  512   6   7     79493997.45854475  578  574
 512  512   8   9     79494575.58943175  579  573
 512  512   5   6     79493631.03866175  578  575
 512  512   5   5     79493290.86521725  578  575
 512  512   8   9     79493432.00990875  579  573