This switch toggles the previous setting. In coordinate tracking, the coordinates of the mouse and value of the pixel under it are printed in the upper-left text area, above the main display window. This makes it possible to run the SAOimage program on a machine other than the one connected to your display screen, with no difference in appearance or use. See the xhost manual page for more details. The display server cannot be changed once SAOimage is running.
Image file is a FITS file.
If the image filename ends in .fits , this switch is not necessary. IEEE floats are not converted if that is not the machine format. These coordinates, followed by B1950 will be fed to an external program if the w command is used. These coordinates, followed by J2000 will be fed to an external program if the w command is used. If WCS information is available in the image header, track the cursor in galactic longitude and latitude as well as pixel coordinates.