Dan could you add like a Diameter 2 function, which you click yes or no, or check a box, to enable it. Along with that it enables another box for period. You could then have presets (Lyrae, Cepheid I, Cephied II, T Tauri...). Eventually, you could add a fuction for what star it is OBAFGKM, 0-9, I-VII. This would have a script to take Diameter 1 and [a box named] Spectral Type (which you input spectral type), that makes it pulsate and change color! Awesome. Right?