data analysing graphs from excel

hi, i have a question at excel. if you can help me??
i need to do data analysing graphs from excel, and they look more or the less the same like this one. and i want to separate them to steps automatically with equation or vba. of course the date always changes but the graph is in the same shape (stages) always. 
stage 1: heating untill the curve
stage 2: temp the same more or less (from the end of stage 1). called same temp 1.
stage 3: first cooling (with leaniar equation automatically)
stage 4: same temp 2.
stage 5: secound cooling  (with leaniar equation automatically).
stage 6: same temp 3

By: shay

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