Fit Type B:  Fit the mass peak for the signal region definition
Obtain the error on the signal region definition from that fit:
Mean: 3.09354
Sigma:0.0159857
Norm: 31801.6
Signal fraction: 0.901879+/-0.000930529
The fitted value of tau:       0.0458407+/-0.00073946
The fitted value of Lambda+:   0.0306161+/-0.00133337
The fitted value of Lambda-:   0.0208164+/-0.00124225
The fitted value of LambdaSym: 0.0663545+/-0.256274
The fitted value of F+:        0.15964+/-0.00590167
The fitted value of F-:        0.104083+/-0.00513464
The fitted value of FSym:      0.0237987+/-0.00207827
The fitted value of Scale:     1.04217+/-0.00523259
The fitted value of alpha:     0.900508+/-0.000919623
The fitted value of Bfrac:     0.185082+/-0.00278122