McCabe-Thiele Graphing for an Ideal Mixture

This script computes and plots required number of stages in distillation column. The values of reflux ratio, boilup ratio as well as percentage of LK in distillate in bottoms are needed to run this script. Optionally, if you have Murphree's efficiency values, a second graph, based on this parameter will appear as well. There is no need to input these values in code itself, just run the script and follow directions. Please let me know how I could improve this script/make it more user friendly.