V1.1

The handling of World Co-ordinate System (WCS) information within POLPACK has been improved, and is now consistent with WCS handling within KAPPA V0.13:

• New sections have been added to SUN/223 describing the use of RA/DEC calibrations within POLPACK, and how to use GAIA to create them.
• POLKA now propagates WCS information from input to output. This makes it possible to retain WCS information throughout an entire POLPACK reduction.
• The COSYS parameter used by POLPLOT has been replaced by FRAME. A new parameter called EPOCH has been added to allow the specification of an epoch for celestial co-ordinate systems.
• POLVEC no longer stores a GRID co-ordinate Frame in the output catalogue (since there is no data grid defined within a catalogue).
• WCS information can now be read from a FITS or IRAS90 NDF extension if the NDF has no WCS component.
• A bug has been fixed which caused POLPLOT to display vectors in incorrect positions when annotating the axes with sky co-ordinates. This bug was not seen if the vectors were plotted over an existing picture.
• Catalogues created by POLVEC now inherit the Current co-ordinate Frame from the supplied Stokes cube. Previously the Current Frame was always reset to pixel co-ordinates.
• The vector positions in the catalogue supplied to POLPLOT must now be given in the Base Frame of the WCS information stored in the catalogue.

Other non-WCS related changes include:

• Vectors produced by POLPLOT no longer intersect the border.
• If POLKA is used to define a sky region which is then transferred to a second image, the sky region will be ignored if it does not have an overlap with the second image. In this case, a warning is issued and the user is asked to specify a new sky region for the second image.
• The handling of graphical styles within POLPLOT (using parameters STYLE and KEYSTYLE) is now consistent with KAPPA V0.13. In particular:
  1. Defaults for unspecified plotting attributes are now read from file $KAPPA_DIR/style.def.
  2. The values supplied for STYLE and KEYSTYLE are retained and re-used on subsequent invocations of POLPLOT (unless new values are given).
  3. The size of text produced for a given value of the Size attribute is now (roughly) proportional to the size of the picture being used.
  4. The default title is now obtained from the TITLE component of the Stokes cube. Previously it was obtained from the Title attribute of the WCS information.
  5. A new parameter called ``RAY'' has been added to POLEXT to allow the RAY component of the POLPACK extension to be assigned a value.
• The vertical spacing between lines in the key produced by POLPLOT can now be controlled using the TextLabGap attribute (see parameter KEYSTYLE).
• A new parameter called MARGIN has been added to POLPLOT. It can be used to specify the widths of the margins left for axis annotation around the vector map.