COORDINA Type: Adverb (Real(6)) Use: An array adverb used to convey coordinate values as: Xpos = abs(COOR(1)) + abs(COOR(2))/60 + abs(COOR(3))/3600 if any of COOR(1), COOR(2), COOR(3) < 0: Xpos = -Xpos Ypos = abs(COOR(4)) + abs(COOR(5))/60 + abs(COOR(6))/3600 if any of COOR(4), COOR(5), COOR(6) < 0: Ypos = -Ypos Note that, although these are most suited to RA, Dec in sexagesimal notation, they can be used for any type of coordinate. The units are standard units of the X and Y axes (e.g degrees, m/sec, Hz, sec, etc.) except that right ascensions are in hours of time. It is normal in print to represent a declination between -1 and 0 degrees as -0d mm ss.s. But if you type, e.g. COORDINA = 14, 8, 23.3, -0, 14, 23 you will get a positive declination because there is no difference numerically between -0 and +0. You need to type COORDINA = 14, 8, 23.3, -0, -14, 23 to get the desired negative coordinate. BE VERY CAREFUL when you type negative coordinates to use commas to separate the values. Otherwise the minus sign becomes a subtraction sign and you do not get the desired values in the adverb. Null value: None, 0 means 0. Verbs: CODECIML....Convert between decimal and sexagesimal coordinate values COODEFIN....Define or modify an image axis coordinate description COPIXEL.....Convert between physical and pixel coordinate values COSTAR......Plot a symbol on the TV at the specified coordinate. COTVLOD.....Load a TV image centered on the specified coordinate. COWINDOW....Set BLC, TRC centered on a coordinate. EPOCONV.....Convert between J2000 and B1950 coordinates IMCENTER....Returns pixel position of sub-image centroid IMPOS.......Displays celestial coordinates selected by the TV cursor IMVAL.......Returns image intensity and coordinate at specified pixel MAXFIT......Returns pixel position and image intensity at a maximum QIMVAL......Returns image intensity and coordinate at specified pixel quietly Build-in procedures: TVFLUX......Displays coordinates and values selected with the TV cursor TVMAXFIT....Displays fit pixel positions and intensity at maxima on TV Tasks: FLATN.......Re-grid multiple fields into one image incl sensitivity COORDINA selects the output central coordinate. PBCOR.......Task to apply or correct an image for a primary beam. COORDINA provides the pointing center if necessary SDVEL.......Shifts spectral-line single-dish data to a given velocity. COORDINA provides the coordinate to be used for the velocity reference. SPCOR.......Task to correct an image for a primary beam and spectral index. COORDINA provides the pointing center if necessary. SUFIX.......Modifies source numbers on uv data. COORDINA provides the coordinates of a new source.