A new window will be opened on the screen and the user will define the name of the coordinate fields and the limits of the sky region. The only way to remove the constraints is to set to zero all the values of the limits. The user must enter here the name of the first coordinate of the sky zone that he needs to select. First coordinates can be Right Ascension, galactic longitude and so on. The user must enter here the name of the second coordinate of the sky zone that he needs to select.
Second coordinates can be declination, galactic latitude and so on.
Units are degrees. The values must be entered from South to North. This task does not produce output on file, but writes the output only on the screen.