Maximum value at each point

Hi there,
I'm fairly new to Comsol so please excuse me if the question is trivial:
I have modelled the temperature profile in 3D for a slab that is heated intermittently from either side. What I now require is the maximum value at each point - as the system goes through non-reversible changes at particular temperatures, I would like to generate a chart (pie or bar) showing the following:
-Percentage which never reaches 45 °C (raw)
-Percentage which reaches between 45 and 50 °C (rare)
- Percentage which reaches between 50 and 55°C (medium)
- Percentage which reaches between 55 and 60 °C (medium-well)
- Percentage which reaches between 60 and 65 °C (well)
- Percentage which reaches above 65 °C (dead)
Is there a simple way for generating this data? Essentially I just require those 6 numbers!
Thank you very much in advance!