How do I create a diagram like the one below using DensityPlot?

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Below is my code, you need to use the DensityPlot function or similar to it to build the diagrams shown in the image. What code do I need to add to my program to make this happen? Please help, I need it for my Bachelor’s degree!

This code solves a differential equation, the solution of which is a phase velocity graph consisting of maxima, i.e. peaks. Each time jdc and jac are changed from 0 to 3, different dependencies are built, where 1, 2 or more peaks are visible on the graph in one period. And after that, you need to build a chart like this. jth - a threshold equal to 2.08.

0tdlg.png
0tdlg.png963×656 81.1 KB

Spike1_.nb (439 KB)

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Cross-posted at https://mathematica.stackexchange.com/questions/284503/how-do-i-add-or-correct-my-code-to-build-a-chart-like-the-one-on-the-picture.