+ #these need to get generalized, sheesh
+ my %data = (
+ # rows (time intervals)
+ speriod => [], # start timestamps
+ eperiod => [], # end timestamps
+ label => [], # date labels
+ data => [], # arrayrefs of column values
+
+ # columns (observables + query parameters)
+ items => $self->{'items'},
+ item_labels => $self->{'item_labels'} || $self->{'items'},
+ colors => $self->{'colors'}, # no default?
+ links => $self->{'links'} || [],
+ );