DA with imposed parallel decomposition

[Dave May]

Hello,
  Suppose I have a DA and I enforce the parallel decomposition during
creation by specifying the arrays lx[], ly[], lz[] in DACreate3d(). If I now
create a second DA using DARefine(), am I alays also able to obtain an
interpolation operator between the two DA's via DAGetInterpolation()?

Under what circumstance will DAGetInterpolation() fail when used between
DA's generated in this manner?

Cheers,
  Dave
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