there are no question marks in your previous posts.
suggesting you were trying to add facts to the discussion.
are you even using heptane denatured ethanol? (are you trying to figure out how to deal with residual solvents? maintain the same solvent formulation from run to run?)
then asking rather than telling works better…
the vapor pressure chart for heptane might then be of more immediate use to the chemist, but I’d be happy to explain its implications if they can’t.