C1_CP_STA_PSD is unplottable, because it is a rank 3 dataset, with the last dimension a labels dataset:
DEPEND_0 STRING 'Time__C__CP_STA_PSD'
DEPEND_1 STRING 'FREQUENCY__C__CP_STA_PSD'
DEPEND_2 STRING 'LABELS_2'
TIME__C__CP_STA_PSD
STRUCT -> <Anonymous> Array[1]
FREQUENCY__C__CP_STA_PSD
STRUCT -> <Anonymous> Array[1]
LABELS_2 STRUCT -> <Anonymous> Array[1]
Logged In: YES
user_id=1578913
Originator: YES
This is resolved for C?_CP_STA_PSD by introducing a plugin.