grib/src/main/java/ucar/nc2/grib/collection/GribCollectionMutable.java
static MFile makeIndexMFile(String collectionName, File directory) {
    String nameNoBlanks = StringUtil2.replace(collectionName, ' ', "_");
    return new GcMFile(directory, nameNoBlanks + GribCdmIndex.NCX_SUFFIX, -1, -1, -1); // LOOK dont know lastMod, size. can it be added later?
  }
static MFile makeIndexMFile(String collectionName, File directory) {
    String nameNoBlanks = StringUtil2.replace(collectionName, ' ', "_");
    return new GcMFile(directory, nameNoBlanks + GribCdmIndex.NCX_SUFFIX, -1, -1, -1); // LOOK dont know lastMod, size. can it be added later?
  }
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