* First select the number (1,..., 7) of the exercise.
* A description of the exercise will be displayed. The parameter values are adjusted.
* Solution after pressing "Show solution".
* The number 0 corresponds to a "Reset": Same setting as at the program start.
* "Red" refers to the first parameter set ⇒ $x_1(t) \circ\!\!-\!\!\!-\!\!\!-\!\!\bullet\ X_1(f)$.
* "Blue" refers to the second parameter set ⇒ $x_2(t) \circ\!\!-\!\!\!-\!\!\!-\!\!\bullet\ X_2(f)$.
* Values with magnitude less than $0.0005$ are output in the program as "zero".