I was once created Web-Mathcad-sheet for the calculation a speed of sound in water/steam.
See the picture here - http://twt.mpei.ac.ru/rbtpp/P3.PNG
I've been thinking of what looks like the drawing, and finally realized that it was - http://twt.mpei.ac.ru/rbtpp/wspWAVE.PNG
But today I see that it is so:
