Fit: 3 lines
Free parameters: 2x boundary points between lines
Algorithm: Nelder-Mead, 10 iterations. (Centroid defined incorrectly from entire simplex instead of best two
vertices)

Attach 1 - height (difference between intercepts)
Attach 2 - rise times (x-diff between boundary points). Note peak at tr=100 is spurious.
Attach 3 - alpha signal. Fit from Excel Solver (GRG nonlinear)
Attach 4 - Signal incorrectly identified as H20 tr100 signal. 
Fit displayed is correct, from Excel Solver (GRN nonlinear) tr seems 200 samples instead of 100 reported.
Attach 5 - Slow signal, poorly fitted by fitting functions
Attach 6 - Comparison between signals at H=110
Attach 7 - Heat map