Modes

The results of this fitting process can be used in a number of ways to give different output products. The modes are known by name,

• SEARCH mode. All or part of the input image is searched for peaks above a user specified significance threshold. The parameters describing each source are output.
• PARAM mode. PSS performs the fit at fixed points on the image, and returns the optimum fit parameters at each point.
• UPLIM mode. Similar to PARAM mode, but the fit parameters returned are the upper limits at a user definable level of confidence.
• UPMAP mode. PSS maps the value of the upper limit flux over all or part of the image.

This tutorial section will examine an example session using each mode in the order above. Test data for use in the tutorials can be found in the logical directory AST_DEMO -- make your own copies using,

   > copy ast_demo:pss_demo.sdf my_pss_demo