My recent posting using images generated from Gnuplot was rather basic. After examining its quite voluminous documentation somewhat cursorily, I have been able to significantly improve the output.
For example, the impact of tax rates and cost of capital on investment in Class 29 assets is illuminated through the use of colour:
Here it is for Class 53:
And for Class 43:
You can note the impact quite distinctly between the three graphs.I have only just begun to explore this particular application, but I am already impressed with its power.