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To return the index of the attribute attached to the vdata , set the value of the parameter field_index to _HDF_VDATA (or -1). To return the index of the attribute of a field in the vdata , set the value of the parameter field_index to the field index. Valid values of field_index range from 0 to the total number of the vdata fields - 1. The number of the vdata fields is returned by VFnfields.
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