These lines get the numbers from the user for you. Put as many as you need. The "input name" is the name of the variable you used in your Perl program. The "size" is how many digits you want to let it have.

Initial height (in meters):

Time to run simulation for (in seconds):

Step time (in seconds):

Integration: Euler Heun Runge-Kutta 2 Runge-Kutta 4

Style: lines points impulses dots