8.518580e-01 f-delta = 3.0e-03
 Iter 21: f = 8.549459e-01 f-delta = 3.1e-03
 Iter 22: f = 8.583117e-01 f-delta = 3.4e-03
 Iter 23: f = 8.620862e-01 f-delta = 3.8e-03
 Iter 24: f = 8.663939e-01 f-delta = 4.3e-03
 Iter 25: f = 8.713540e-01 f-delta = 5.0e-03
 Iter 26: f = 8.770652e-01 f-delta = 5.7e-03
 Iter 27: f = 8.835659e-01 f-delta = 6.5e-03
 Iter 28: f = 8.907687e-01 f-delta = 7.2e-03
 Iter 29: f = 8.983839e-01 f-delta = 7.6e-03
 Iter 30: f = 9.058962e-01 f-delta = 7.5e-03
 Iter 31: f = 9.126883e-01 f-de