### AST.ZERO_CIRCLE

Reduces spurious large scale structure in the final map outside a circle of given radius

#### Description:

Using ast.zero_circle defines a circle on the map outside of which the map will be constrained to zero on each iteration (but see parameter "ast.zero_notlast" ). If a value is supplied for this parameter, it can be a single real value, or a comma-separated list of three real values in parentheses. If one value is supplied, it should be the radius of the circle in decimal degrees (the centre of the circle defaults to the coordinates at the tangent point of the map). If three values are supplied they should be the central longitude, latitude and radius of the circle, in decimal degrees, in the coordinate system of the map (e.g., RA and Dec.). [$<$undef$>$]
Type:
real

MAKEMAP, CALCQU