Data Reduction Using POLPACK

This section gives a detailed description of the steps involved in using POLPACK to produce a vector map from single-beam or dual-beam polarimetry or spectropolarimetry data. It is assumed that the data conforms to the model outlined in one of the two previous sections. An over-view of the data reduction process is given in the next figure:

The main steps in the production of a polarization map.

All POLPACK applications use standard Starlink subroutine libraries for accessing parameters, producing graphics, reporting errors, etc. They therefore look and feel very similar to applications in other Starlink packages such as KAPPA and CCDPACK. The following sections in SUN/95 (the KAPPA manual) should therefore be consulted for general information about these issues:

• ``Parameters''
• ``Graphics Devices and Files''
• ``Plotting Styles and Attributes''
• ``Data Structures''
• ``NDF Sections''
• ``NDF History''
• ``The Graphics Database''
• ``Using World Co-ordinate Systems''
• ``Procedures''