if ( settings.get(TIME_REFERENCE_INITIAL_DATE + "_" + refTimeIndex)!=null) {
initialDate = ((Long)settings.get(TIME_REFERENCE_INITIAL_DATE + "_" + refTimeIndex)).longValue();
}
try {
ret= new JSSynchronousMergeDSCollection(
collectionName,
interpolationOrder,
collectionTimeReferenceIsRelative,
mergedTimeReferenceDs,
refTimeIsRelative,