Reading values under the DATA/status tab

I am doing some graphing of data under the DATA/Status tab. My board is Mateksys F765-WSE. Although there are some other variables I am not sure of, for now I have set my focus on these:
ELToMAV
AZToMAV
Could anyone please shed some light on what they mean?
Is there an explanation of the other Status variables available somewhere?

Thanks, Helge.