how to create multiple store in chart?

i use php. i want to create multiple line by multiple store in chart.

Why I use this method because I want to select data in column 2 the same as station A and staion B in the period from 1996-04-01 to 1996-04-10

****(The station A and station B is within the same column, which is a problem for me to write PHP. I have to avoid using this method. But I can not write multiple line in chart with multiple store calls it). ****

I would like to bring the values that have to plot the graph. as a multiple line by line, one data station A is a line of data is one station B.

how to do it?
please help me.
or anybody have other ways or examples, please point the way to do me. I do not know really.