le
 weight.  A desired property of the masks is that their coverage (the
 total weight placed on the pixel by all the masks) is approximately
 constant.  Typically, we settle for having the coverage be monotonically
 decreasing as we move away from the center.  (In reality the coverage
 oscilates as we move past peaks, it's just that the oscillations tend to
 be small).  The default value of the width is .6, which minimizes overlap
 while still providing good overall coverage. Values lower tend to pr