Placing glyphs on surface

Hi,
I am currently generating surfaces using the MathType:
((trial_number, time) -> variable1)

But I have a function that has more variables like:
((trial_number, time) ->(variable1,variable2))

I wanted to display the variable2 as a bar graph or some other glyph on the surface generated by variable1.
How do I do this?
Thanking you in advance,
Jay




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