vCops Reports - what does the y-axis represent ?

I have produced various types of reports and graphs, and do not see a definition of what the values on the y-axis represent.

For instance

A Virtual Machine CPU Diagnose report show numbers on my graph -2.5 going up to 20.

Does this represent %?

A Virtual Machine Disk Write IOPs Forecast report show numbers on my graph -100 going up to 900

Are these disk IOPs from the VM Disk ?

VM IOPs Trend View report show numbers on my graph 0 going up to 3 (0, 0.5, 1, 1.5...)

Are these Per Second?

Virtual Machine Disk I/O Latency Diagnose show numbers on my graph -0.025 to 0.13 (-0.025. 0, 0.025, 0.005,,,)

Are these Per Second?

Also, does anyone know how to reduce the size of the graphs so the labels at the bottom fit?

thanks