 Iter 12: fit = 4.920996e-001 fitdelta = 4.8e-004
 Iter 13: fit = 4.924246e-001 fitdelta = 3.2e-004
 Iter 14: fit = 4.926962e-001 fitdelta = 2.7e-004
 Iter 15: fit = 4.929575e-001 fitdelta = 2.6e-004
 Iter 16: fit = 4.932285e-001 fitdelta = 2.7e-004
 Iter 17: fit = 4.935198e-001 fitdelta = 2.9e-004
 Iter 18: fit = 4.938385e-001 fitdelta = 3.2e-004
 Iter 19: fit = 4.941904e-001 fitdelta = 3.5e-004
 Iter 20: fit = 4.945813e-001 fitdelta = 3.9e-004
 Iter 21: fit = 4.950178e-001 fitdelta = 4.4e-004
 Iter 22: fi