Regions

Can Highlite

The Highlite property specifies if the edit handles become visible when the region is selected.

Dash

Render region using dashed lines using current dashlist value.
Example: circle(100,100,20) # dash = 1

Fixed in Size

The Fixed in Size property specifies that the region does not change in size as the image magnification factor changes. This allows the user to build complex pointer type regions.
Example: circle(100,100,20) # fixed = 1

Source/Background

The Source/Background properties flag the region for use with other analysis applications. The default is source
Example: circle(100,100,20) # source
         circle(200,200,10) # background

Composite Region

A Composite Region is a region which is a collection of other regions, which share common properties. A composite region is composed of a center point and a rotation angle, of which all its members are rendered in reference to. A composite region is defined by the # composite x y angle declaration followed by a number of regions who are or'd together. A composite region is manipulated as a single region within ds9. A composite region maybe created from the current selection of regions by selecting the Create Composite Region menu option. Likewise, a composite region can be dissolved by selecting the Dissolve Composite Region menu option.

Template Region

A Template Region is a special form of a region which is saved in a special wcs coordinate system WCS0. WCS0 indicates that the ra and dec values are relative to the current WCS location, not absolute. A template region can be loaded at any location into any fits image which contains a valid wcs. For example, a user may create a series of regions, which represent an instrument template. Then, by selecting the Save As Template menu option, a template region saved. The user may now load this templated into any other fits image which contains a valid WCS.