sfit[10] = (1 - x)^0.24362224213562889*x^0.23503751881237414*
     (0.3320289203040242 + 0.037380796560604675*(1.395109261635039 + 
        3.9023992062425754*(-2 + 2*x) + 1.947466686673353*(-2 + 2*x)^2) + 
      0.04855581165205054*(0.008584723323254745 + 2.478659760948003*
         (-1 + 2*x)))
 
sfit[12] = (1 - x)^0.2435206248257603*x^0.08551820881923135*
     (0.2971760878281575 + 0.037778294564126305*(1.3949320845964046 + 
        3.7343836420642154*(-2 + 2*x) + 1.8014422986951748*(-2 + 2*x)^2) + 
      0.07501023151130602*(0.15800241600652898 + 2.3290388336449914*
         (-1 + 2*x)))
 
sfit[15] = (1 - x)^0.2676001637488393*x^0.3090892485199922*
     (0.38423721766389346 + 0.03767482060425719*(1.4372051694424617 + 
        4.055250748469771*(-2 + 2*x) + 2.0461745705130987*(-2 + 2*x)^2) + 
      0.07342218758809432*(-0.04148908477115287 + 2.5766894122688315*
         (-1 + 2*x)))
 
sfit[20] = (1 - x)^0.271594546131041*x^0.37328160446964725*
     (0.43078452362182335 + 0.024713436313440855*(1.4442736179406246 + 
        4.139840392513814*(-2 + 2*x) + 2.1162497879772975*(-2 + 2*x)^2) + 
      0.09305258430407475*(-0.10168705833860625 + 2.6448761506006884*
         (-1 + 2*x)))
 
sfit[30] = (1 - x)^0.31153647984398625*x^0.38473403005633194*
     (0.497024864719585 + 0.027237576110146065*(1.5158322089027705 + 
        4.272032061503059*(-2 + 2*x) + 2.1698357740323844*(-2 + 2*x)^2) + 
      0.14104113233404852*(-0.0731975502123457 + 2.696270509900318*
         (-1 + 2*x)))
 
sfit[40] = (1 - x)^0.3427352577077333*x^0.3948669970628788*
     (0.5506396750724021 + 0.03921572126243174*(1.572836614999593 + 
        4.378106290769517*(-2 + 2*x) + 2.213409108704622*(-2 + 2*x)^2) + 
      0.17865941778843658*(-0.052131739355145534 + 2.737602254770612*
         (-1 + 2*x)))
 
sfit[50] = (1 - x)^0.36457551255297754*x^0.4050195728858076*
     (0.5940450273301505 + 0.056148216650967586*(1.6133209210060995 + 
        4.4567461156343*(-2 + 2*x) + 2.247430274200378*(-2 + 2*x)^2) + 
      0.20739093006248863*(-0.040444060332830045 + 2.769595085438785*
         (-1 + 2*x)))
 
sfitAll[10] = ((1 - x)^0.23682976030567204*(0.12208043107847259 + 
       0.06850568755522249*(1.383288808141729 + 3.0060305947669654*
          (-2 + 2*x) + 1.2389765964358739*(-2 + 2*x)^2) + 
       0.10696000093377754*(0.7858996846941224 + 1.6877598359172215*
          (-1 + 2*x))))/x^0.5490699243884504
 
sfitAll[12] = ((1 - x)^0.20288929998927166*(0.0983259146162377 + 
       0.07205268894491265*(1.324915984008976 + 2.832447558381696*
          (-2 + 2*x) + 1.1480716452861532*(-2 + 2*x)^2) + 
       0.11817841823911729*(0.8342035704067068 + 1.5715750295718363*
          (-1 + 2*x))))/x^0.6313142704174352
 
sfitAll[15] = ((1 - x)^0.22541086044733036*(0.11618153607016828 + 
       0.08323495818817901*(1.3635213186747985 + 2.951180268741512*
          (-2 + 2*x) + 1.2108401719008546*(-2 + 2*x)^2) + 
       0.13137708558179614*(0.798565168009595 + 1.6522565528850657*
          (-1 + 2*x))))/x^0.5731543075622646
 
sfitAll[20] = ((1 - x)^0.2565649845354224*(0.143937508742433 + 
       0.10137409818005326*(1.4177602724479645 + 3.10786751496077*
          (-2 + 2*x) + 1.2927309370465785*(-2 + 2*x)^2) + 
       0.15261573672787182*(0.7586181014672516 + 1.7545118676035933*
          (-1 + 2*x))))/x^0.5020531169318292
 
sfitAll[30] = ((1 - x)^0.2990305342309952*(0.18627874425107938 + 
       0.13354190618922787*(1.4932554315477298 + 3.305431994204075*
          (-2 + 2*x) + 1.393000650558336*(-2 + 2*x)^2) + 
       0.18862635148799503*(0.7225603345757289 + 1.8755007338862615*
          (-1 + 2*x))))/x^0.4235298003447337
 
sfitAll[40] = ((1 - x)^0.33777927937009616*(0.24919860591690632 + 
       0.15642905798687137*(1.563716339841035 + 3.5459056992899822*
          (-2 + 2*x) + 1.5295124680175123*(-2 + 2*x)^2) + 
       0.21696495705150468*(0.6419909926478023 + 2.03356756609239*
          (-1 + 2*x))))/x^0.3042117132777062
 
sfitAll[50] = ((1 - x)^0.35587133484555067*(0.28935572899233186 + 
       0.1750323191275868*(1.5971292057507032 + 3.6663874075497294*
          (-2 + 2*x) + 1.6000675598504706*(-2 + 2*x)^2) + 
       0.2385040612249342*(0.5991894896252684 + 2.112553180065833*
          (-1 + 2*x))))/x^0.24331815477971777
 
fitMassSquared = -0.5057848663070794 + 3.8727746426452203/k^2 - 
     0.1039900081767631/k - 0.010358811973834557*k + 
     0.23903608536559426*Log[k]
