Below (when it's finished loading) is a time-frequency map of energy density of simulated signal (below, red)
Click on a time-frequency blob to add it to the reconstruction (black). Fields in the lower panel: gamma lets you input values of the gamma correction coefficient, Color toggles to grayscale, crosses indicate centers of time-freq. atoms, frequency split >1 lets you zoom into the lower part of the picture. Left window gives time-frequency coordinates of the cursor, lower one - parameters of a t-f atom pointed by cursor.

Here are hints for finding the simulated structures.