I am not exactly sure which type of butterfly curve you need to plot, but probably you need to plot two variables against each other (like XY plot of oscilloscopes).
For this, you can run a time-domain (transient) simulation to plot one of the variables (Y axis) and then rename (change) the "time" axis (X axis) as the other variable.
However, effect of any delay between the variables will also be observed on the plot (which may be desired or not). Therefore, if you need a "static" behavior plot, you should make sure the delays are negligible for the "signals" you are plotting against each other.
If this answer is not helpful, please provide a sample view of the plot you need to obtain with more details, so I can see if I can suggest any alternative methods.
I recommend using Micro-Cap (http://www.spectrum-soft.com/download/download.shtm). All EE's at Emerson used Micro-cap, even though it cost $4,000 each. There are no other electronic SPICE modeling programs even close to Micro-Cap capability.
Micro-Cap is now free. Andy Thompson, owner of Spectrum Software, has retired.
Micro-Cap does worst case analysis --- changing the tolerances of components --- changing the temperature --- etc. And it is easy to use.
I have used Micro-Cap for all of my electronic designs since 2001. When I tested prototypes, they worked exactly as the model predicted.
The website --- https://NDAcademy.FoxPing.com/ --- 2.8 Electronic Cascade RC Filters --- and --- 7.2 Electronic SPICE Models --- provide examples.