+++ Labels is an array of nul-terminated strings to be used as labels.
If this field is NULL but nlabels is > 0, then numeric labels will be
provided. NOTE: the labels are not copied to any internal memory; they
+++ Labels is an array of nul-terminated strings to be used as labels.
If this field is NULL but nlabels is > 0, then numeric labels will be
provided. NOTE: the labels are not copied to any internal memory; they