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Version 1.9 Build 803

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How to interactively define one or more CLEAN regions

1. To zoom on a region, left-click on the Zoom function on the top left of the pop-up Viewer. Use the left mouse button to draw a region around the source emission. Note: once the box is finished, you can move each point defining the region until it is the size you desire. Double left-click in the region to zoom in.
2. To make a box-mask, left-click on the box region function. Use the mouse button to create a box. To make a polygon-mask, left-click on the polygon region function on the left of the pop-up Viewer. Use the mouse button to create a polygon. Note: once the polygon is finished, you can move each point defining the region until it is the shape you desire.
3. Left-click on `Add Region'
4. Double left-click in the region you just made (this will add the region to the mask file). The region will be reported on the Glish command prompt.
5. Left-click on `Refresh mask' to see the clean region(s) you have specified displayed on the image.
6. Hit the <ESC> key on the keyboard to remove the polygon or box outline.
7. Define more regions and add if desired.
8. To delete all or part of the mask:
   • Left-click on `Remove region'
   • Draw a box or polygon around the mask area you want to remove,
   • Double left-click in the box or polygon.
   • Left-click on `Refresh mask' to see your new region.
9. When finished, left-click on `Done with Masking'
10. The CLEAN algorithm will continue using the region(s) to restrict the location of clean components.
11. You will be given the option to examine the results every npercycle time selected. If you want to stop the cleaning process, left-click on the `Stop' button.

Note: at this time, if you want to interactively define the CLEAN region or mask and then CLEAN down to a specified threshold level without continuing to set or change the mask, run CLEAN with niter set to a small number and interactive=T to define the mask. Then re-start CLEAN with niter set to a large number, threshold set to the level you want, mask set to your newly made mask, and interactive=F.