step1:
B1=11000:	time=  0.06618947*x^1.63947404		R^2=0.99740883
B1=50000:	time=  0.32799091*x^1.62420690		R^2=0.99716062
B1=250000:	time=  1.62356806*x^1.62660620		R^2=0.99736380
B1=1000000:	time=  6.45743943*x^1.62785122		R^2=0.99728308
B1=3000000:	time= 19.49056279*x^1.62741825		R^2=0.99723878
B1=11000000:	time= 71.53986250*x^1.62759538		R^2=0.99725275
B1=43000000:	time=279.53763920*x^1.62816078		R^2=0.99731513

step2:
B2=1873422	time=  0.24195158*x^1.31409576		R^2=0.98749106
B2=12746592	time=  0.69005371*x^1.36055872		R^2=0.98939129
B2=128992510	time=  4.04003439*x^1.30326485		R^2=0.99307558
B2=1045563762	time= 16.25154414*x^1.31649747		R^2=0.99340390
B2=5706890290	time= 39.36354432*x^1.31323410		R^2=0.99307683
B2=35133391030	time=106.70682480*x^1.34847041		R^2=0.99290182
B2=240490660426	time=325.35056428*x^1.35694194		R^2=0.99403036

step1:
digits=100:	time=0.01318986*B1			R^2=0.99999987
digits=200:	time=0.03341413*B1			R^2=0.99999884
digits=300:	time=0.06689847*B1			R^2=0.99999894
digits=400:	time=0.10527653*B1			R^2=0.99999870
digits=500:	time=0.15391102*B1			R^2=0.99999840
digits=600:	time=0.21476213*B1			R^2=0.99999930
digits=700:	time=0.27909237*B1			R^2=0.99999924
digits=800:	time=0.35713810*B1			R^2=0.99999909
digits=900:	time=0.41845367*B1			R^2=0.99999880
digits=1000:	time=0.52565812*B1			R^2=0.99999922

step2:
digits=100:	time=0.01602334*B2^0.62477004		R^2=0.99923499
digits=200:	time=0.02838692*B2^0.63019305		R^2=0.99908331
digits=300:	time=0.04211172*B2^0.63615224		R^2=0.99900621
digits=400:	time=0.06503099*B2^0.63425420		R^2=0.99915316
digits=500:	time=0.09241708*B2^0.63257665		R^2=0.99925000
digits=600:	time=0.12089330*B2^0.63394735		R^2=0.99896841
digits=700:	time=0.15636431*B2^0.63233869		R^2=0.99908675
digits=800:	time=0.20195426*B2^0.63088633		R^2=0.99916820
digits=900:	time=0.23623414*B2^0.63129199		R^2=0.99916354
digits=1000:	time=0.27807272*B2^0.63096546		R^2=0.99920915