sfit[10] = (1 - x)^0.21589337089758087*x^0.4697236534439679*
     (0.07402630522272383 + 0.054583098147805764*(1.3471450301451318 + 
        4.083467165952853*(-2 + 2*x) + 2.158673734307225*(-2 + 2*x)^2) - 
      0.015502808021020987*(-0.253830282546387 + 2.685617024341549*
         (-1 + 2*x)))
 
sfit[12] = (0.028510123745762336 + 0.02865365233144496*
       (0.7554174966157202 + 2.417473634505226*(-2 + 2*x) + 
        1.2062584870712971*(-2 + 2*x)^2) - 0.009415259199471086*
       (0.007491823515359569 + 1.6464373339652545*(-1 + 2*x)))/
     ((1 - x)^0.17303542125969307*x^0.18052724477505264)
 
sfit[15] = (x^0.04850913519729678*(0.021764215065975447 + 
       0.02437404751061822*(0.8114939089454579 + 2.7253867530400324*
          (-2 + 2*x) + 1.4283049670073364*(-2 + 2*x)^2) - 
       0.00676009836201301*(-0.17993768368630028 + 1.9170805867082934*
          (-1 + 2*x))))/(1 - x)^0.1314285484890035
 
sfit[20] = (x^0.6107665935110764*(0.012266338684706174 + 
       0.015539296195946179*(0.6582258218973704 + 2.9447086521997203*
          (-2 + 2*x) + 1.8334648221608116*(-2 + 2*x)^2) - 
       0.003307161172483544*(-0.8591869341226934 + 2.362346252899459*
          (-1 + 2*x))))/(1 - x)^0.24842034061161694
 
sfit[30] = (x^0.6590313841076785*(0.0031700363338182836 + 
       0.005373486500963243*(0.2781803306735829 + 2.1368111856519336*
          (-2 + 2*x) + 1.5502875748528109*(-2 + 2*x)^2) - 
       0.0006794808997284946*(-1.261055515084927 + 2.05700725313043*
          (-1 + 2*x))))/(1 - x)^0.6020241309772485
 
sfit[40] = (x^0.6624328085986046*(0.0013267092527985977 + 
       0.0025361836081332022*(0.1242365502737565 + 1.7297185111522282*
          (-2 + 2*x) + 1.387064574470631*(-2 + 2*x)^2) - 
       0.00011041496804865302*(-1.4564065339122352 + 1.8684590832849743*
          (-1 + 2*x))))/(1 - x)^0.7939737253136304
 
sfit[50] = (x^0.6053674398101602*(0.0017681285849478119 + 
       0.0042064620795593515*(0.40885588823811353 + 2.4062626554609987*
          (-2 + 2*x) + 1.6237388627475697*(-2 + 2*x)^2) - 
       0.0001313461916160462*(-1.072066043084003 + 2.138668836536317*
          (-1 + 2*x))))/(1 - x)^0.4666986032738429
 
sfitAll[10] = ((1 - x)^0.4502679077515215*(0.03381285601221247 + 
       0.035823337367357065*(1.7767724560027485 + 3.1506276982709425*
          (-2 + 2*x) + 1.1481367154650217*(-2 + 2*x)^2) - 
       0.0017329701951257046*(1.328876048582205 + 1.5716597669208376*
          (-1 + 2*x))))/x^0.8786081408306836
 
sfitAll[12] = ((1 - x)^0.5677758946730004*(0.021517644500456554 + 
       0.023751797912972012*(2.0128485752953633 + 3.313805825622406*
          (-2 + 2*x) + 1.1553747398879126*(-2 + 2*x)^2) + 
       0.0001321488652643999*(1.5544808847572567 + 1.5810709045887439*
          (-1 + 2*x))))/x^0.9867049900842563
 
sfitAll[15] = ((1 - x)^0.5248213156921931*(0.019891983598993756 + 
       0.02411596429395116*(1.924950680240732 + 3.2779444512953533*
          (-2 + 2*x) + 1.1673473963461944*(-2 + 2*x)^2) - 
       0.0032578316283990534*(1.4530672373773945 + 1.5965753940069916*
          (-1 + 2*x))))/x^0.9282459216852015
 
sfitAll[20] = ((1 - x)^0.5700113843416539*(0.010555785707813872 + 
       0.012712227655048819*(2.017473565652025 + 3.2358277372332647*
          (-2 + 2*x) + 1.1073981896801544*(-2 + 2*x)^2) - 
       0.0018525679913708787*(1.6218800421971602 + 1.5181427264861473*
          (-1 + 2*x))))/x^1.0518686578555063
 
sfitAll[30] = ((1 - x)^0.5788206945746069*(0.00858374821764128 + 
       0.013445651749213429*(2.0357477400958257 + 3.358221052849447*
          (-2 + 2*x) + 1.1734610207740956*(-2 + 2*x)^2) - 
       0.0034702210460013207*(1.5531787679870965 + 1.6044626211621176*
          (-1 + 2*x))))/x^0.9743580734124896
 
sfitAll[40] = ((1 - x)^0.6758387459568216*(0.002312268826287923 - 
       0.011006955553982463*(2.242137124203477 + 3.1695271570043*(-2 + 2*x) + 
         0.9976430676981551*(-2 + 2*x)^2) - 0.0034904771044353333*
        (1.9826803602341356 + 1.3689971316795073*(-1 + 2*x))))/
     x^1.306841614277314
 
sfitAll[50] = ((1 - x)^0.5650221678757529*(0.0027966099632372407 + 
       0.00348247354966751*(2.007158276909137 + 3.101151574269339*
          (-2 + 2*x) + 1.0331131234162072*(-2 + 2*x)^2) - 
       0.0008303812923981396*(1.7120133236939474 + 1.418031012057558*
          (-1 + 2*x))))/x^1.1469911558181947
 
fitMassSquared = -0.0036246242228034076 + 2.192102384106045/k^2 - 
     1.497432761056963/k - 0.2756736584113894*k - 0.003521740282956598*Log[k]
