In 1D horizontal line picture u(x) values are displayed by
the red color and 3v(x) values are displayed by the green color.
1D pictures for different time moments are rendered in the vertical direction
to show transient processes (we will use this script to test alternance
in ionic models later). Threshold voltage Uth = 0.5 and
full ring length is L = 1024 dx.
Heart rhythmsupdated 3 June 2012