par[0]=0.000069+-0.001011
par[1]=3.999934+-0.000164
par[2]=0.999835+-0.000172
par[3]=1.999892+-0.000178
par[4]=2.999967+-0.000185
par[5]=0.199823+-0.000174
chisquare=70.148012

More Points:
par[0]=0.000551+-0.000712
par[1]=3.999910+-0.000121
par[2]=0.999886+-0.000125
par[3]=2.000067+-0.000123
par[4]=2.999915+-0.000127
par[5]=0.199918+-0.000130
chisquare=145.050322490887680

Without Constant
par[0]=3.999913+-0.000121
par[1]=0.999890+-0.000125
par[2]=2.000057+-0.000123
par[3]=2.999919+-0.000127
par[4]=0.199918+-0.000130
chisquare=145.649621

Fixed Constant:
par[0]=0.000536+-0.000712
par[1]=4.000000+-1.000000
par[2]=0.999884+-0.000125
par[3]=2.000070+-0.000123
par[4]=2.999910+-0.000127
par[5]=0.199920+-0.000130
chisquare=145.602523231222932