Plotting data for yourself

These instructions are designed for use by JCMT staff with access to the relevant data and programs.

TPOINT is a powerful plotting and analysis package which is used at JCMT to generate and update the pointing model.

Pointing data files are held at the summit in directories/filenames like
/jac_logs/20090206/20090205-173329.pnt

Copy the relevant file into your working space. As the file contains the data for the full night you will need to edit it if multiple receivers were used to select the data for the receiver of interest. The command sequence below will provide collimations (IE & CA) and a plot of the residuals:

• tpoint
• indat yyyymmdd-hhmmss.pnt
• inmod /home/hthomas/pointing/models/jcmt.mod_100408
• fix
• use ie ca
• fit
• call a9    (or 'g s a' or 'g a a' or 'g z z' or gdist, gscat, ghyst, gsmap, gdist, gam etc)
• gc p tpoint.ps   (to produce tpoint.ps of plot shown in xwindow. The option p produces a colour plot whilst b would produce black and white)
• slist   (to tabulate results/residuals)
• mask n   (to remove the nth datum, after which you could repeat the fitting and rerun slist and call a9)
• quit