What do the different icons mean in the heat detection graphs?

To go to the Legend, you have to open an individual cow by clicking onit and hover over the Legend with your mouse:

The Legend consists of:

The one thing missing in the Legend is the Factor High. It is found in both the left and right graph when you opened a cow by clicking on. The Factor High indicates how much her activity increased during her heat. The higher the peak in the right graph, the higher the blue bar in the left graph, and vice versa.

The right graph shows the last heat of the left graph so you can compare her last heat to previous ones.

To compare the increased activity you check the blue bar. To compare the duration of the heat, you look at the red diamonds. The first red diamond refers to the fact that the cow is in heat, every diamond above the first one is a 2 hour block where she is in heat.