Multiple line chart from SQL

I want to plot 2 lines in chart from 2 SQL datasets.
When plotting 1 line from 1 dataset, it works fine, but not for 2...

This is the payload. Anyone can help with the sequence ?

[{"series":["solar ="], "data" : zz1 , "labels":[""]},{"series":["actual ="], "data" : zz0 , "labels":[""]}];
msg.payload = chart3;

thanks

Didier