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def description(self, key='CCextract', subkey=None):
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desc={'CCextract': 'Version 1.0b - Extracts CC components from CASA model images, using CASA regions.\n\n',
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'model_image': 'CASA model image.',
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'regions': 'List of regions (one per CC subcomponent). Follows the CASA region format (e.g. "circle[[64pix,64pix],16pix]"). Default (empty list) means to take all CLEAN components as one (sub)component.',
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'regions': 'List of regions (one per CC subcomponent). Follows the CASA region format (e.g. "circle[[64pix,64pix],16pix]"). Default (empty list) means to take all CLEAN components as one (sub)component. Also supports a region file in DS9 format (in pixel units). If set to "manual", a graphical interface will open to generate the regions manually.',
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'make_plot': 'If True, a figure will be created with the source image (in greyscale) and the locations of the CLEAN models (different sub-components in different colors).',