Rub that shit with a toothbrush and some of that old school white toothpaste for a while. The scratch will be gone. Don’t use the modern gel toothpastes.
Neat. I assume the h_m is plancks constant so lambda is wavelength. Also T being there means the model takes pressure into consideration. It's still just arithmetic though :D but still a nice model building exercise. Time to dig through my signals book.