i'm trying to draw two normal distribution bell graphs side by side in a same
drawing.

i was able to draw two different bell graphs following the help provided
earlier, but still cannot draw them together with some overlapping tails.

perhaps, the difficulty i have is "selecting" the columns (range?) . i
"selected" all four columns (two columns for taller graph, and the other two
columns for shorter graph), but it draws a linear graph.

any help is appreciated.