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\description{Gets the gradient endpoint circles for a radial gradient, each
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specified as a center coordinate and a radius.}
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\usage{cairoPatternGetRadialCircles(pattern)}
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A list containing the following elements:
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\code{CAIRO_STATUS_PATTERN_TYPE_MISMATCH} if \code{pattern} is not a radial
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\item{\verb{x0}}{[numeric] return value for the x coordinate of the center of the first circle, or \code{NULL}}