o write grid-file(s) in only one format (MDS or MNC): default=MNC (if   using MNC); can force MDS output by setting writegrid_mnc=F in data.mnc
o write grid-file(s) in only one format (MDS or MNC): default=MNC (if
  using MNC); can force MDS output by setting writegrid_mnc=F in data.mnc

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