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SHAPES
The shapes allowed in the ARD file are:
CIRCLE, ANNULUS, BOX, POLYGON, ELLIPSE, COLUMN, ROW, LINE, PIXEL
The first five have their standard meanings. Column means a line of pixels
with the same X value, upto ten columns may be described in a single
shape. Row means a line of pixels with the same Y value, again up to
ten rows may be described at a time. Line means a single line of pixels
joining one point on the image to another. Pixel, means a single pixel,
up to ten discrete pixels may be selected.

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