Others may have heatmaps of the ANT-32 at different heights, but that is not something we regularly produce as most don't have a need for it (each environment will have it's own characteristics that would make any captured heatmaps irrelevant).
As for reading the antenna patterns, a good place to start is here (https://www.youtube.com/watch?v=YAxJtRTzGOc). The outer ring is normalized at 0dB and each ring in reduces by 5dB (so 0dB, -5dB, -10dB, etc). The antennas are rated by where they are -3dB from the maximum gain, so the outer ring effectively marks the maximum gain of the antenna, and then 3db down from the max peaks will be the beamwidth. These are 360deg in the H-plane, but are effectively 45deg in the E-plane (though in this specific antenna's case, the max gain lobes are effectively at 45deg as it would be wrong to measure the -3dB drop towards the 0deg heading, so in effect the -3dB drops are actually both towards the 'inside' and the 'outside', making it a 45deg on the inside, or an approx 100deg on the outside. However, it being such a low dB gain antenna, it's not really super important that you mark it a 45deg or 100deg e-plane. The important thing to note is that coverage is above the connector.