sfit[10] = (1 - x)^0.15104495279598457*x^0.40544805283661*
     (0.3346893942265031 + 0.044512423843356894*(1.2379747180765475 + 
        3.8250881647101065*(-2 + 2*x) + 2.02564193809327*(-2 + 2*x)^2) + 
      0.02981773265316675*(-0.25440310004062544 + 2.5564930056325945*
         (-1 + 2*x)))
 
sfit[12] = (1 - x)^0.14905624037255957*x^0.26450934897817685*
     (0.3152969381200767 + 0.038310962299516284*(1.2346932419558403 + 
        3.667972215857617*(-2 + 2*x) + 1.883249452768772*(-2 + 2*x)^2) + 
      0.05695429116060907*(-0.11545310860561728 + 2.4135655893507364*
         (-1 + 2*x)))
 
sfit[15] = ((1 - x)^0.13777215769262743*(0.2600659749389298 + 
       0.03184781287073241*(1.2161488202565822 + 3.3506488673356682*
          (-2 + 2*x) + 1.6201404371754675*(-2 + 2*x)^2) + 
       0.10231425280365053*(0.14083339188614707 + 2.134710923499108*
          (-1 + 2*x))))/x^0.0030612341935196408
 
sfit[20] = (1 - x)^0.15341839089813658*x^0.3874711899225363*
     (0.4093081625020677 - 0.004589799160534156*(1.2418961876800914 + 
        3.812508371739415*(-2 + 2*x) + 2.009848575548134*(-2 + 2*x)^2) + 
      0.09852997579688347*(-0.23405279902439974 + 2.540889580820673*
         (-1 + 2*x)))
 
sfit[30] = (1 - x)^0.16840375068523203*x^0.7266542024362818*
     (0.6020199286980914 - 0.0631578731447712*(1.2667855376502748 + 
        4.223029137342516*(-2 + 2*x) + 2.3833168014120836*(-2 + 2*x)^2) + 
      0.09096799348362625*(-0.5582504517510497 + 2.8950579531215137*
         (-1 + 2*x)))
 
sfit[40] = (1 - x)^0.15977506372429257*x^1.261824163190071*
     (0.8639489152628816 - 0.08780762100745851*(1.2524266310804897 + 
        4.774829876036127*(-2 + 2*x) + 2.9965173687955073*(-2 + 2*x)^2) - 
      0.013167208238467992*(-1.1020490994657786 + 3.421599226914364*
         (-1 + 2*x)))
 
sfit[50] = (1 - x)^0.20590587067700192*x^1.0489544729098323*
     (0.8556205961938209 - 0.12002655671508487*(1.33005741980513 + 
        4.692910705414482*(-2 + 2*x) + 2.7948371108768386*(-2 + 2*x)^2) + 
      0.06491617353525518*(-0.8430486022328304 + 3.2548603435868344*
         (-1 + 2*x)))
 
sfitAll[10] = ((1 - x)^0.09272731336916928*(0.08169772416804397 + 
       0.07176636414368294*(1.143390147376086 + 2.5164475115538836*
          (-2 + 2*x) + 1.0235885059115155*(-2 + 2*x)^2) + 
       0.10079375475825555*(0.7805091802123413 + 1.4049454465259972*
          (-1 + 2*x))))/x^0.687781866843172
 
sfitAll[12] = ((1 - x)^0.12932819000145113*(0.09301828754196195 + 
       0.08615809104696621*(1.2023551753667023 + 2.6450300350913*(-2 + 2*x) + 
         1.082065393461011*(-2 + 2*x)^2) + 0.11489581208309697*
        (0.7742765201847712 + 1.484379859818131*(-1 + 2*x))))/
     x^0.6449483301833201
 
sfitAll[15] = ((1 - x)^0.1343196001370175*(0.0853236841466904 + 
       0.10487803913748832*(1.2105002776960103 + 2.6126860901333533*
          (-2 + 2*x) + 1.0552806216589865*(-2 + 2*x)^2) + 
       0.13595214365745573*(0.8203778527554856 + 1.4482613475185495*
          (-1 + 2*x))))/x^0.6860582526184681
 
sfitAll[20] = ((1 - x)^0.16019781860460341*(0.09434384052369194 + 
       0.13452544702428346*(1.2531283984497417 + 2.6821989814056564*
          (-2 + 2*x) + 1.0812525141328784*(-2 + 2*x)^2) + 
       0.16550937519612174*(0.8371054882188296 + 1.4832901489903771*
          (-1 + 2*x))))/x^0.6769076696142261
 
sfitAll[30] = ((1 - x)^0.2534238501777136*(0.17063831107886038 + 
       0.17680861443340698*(1.4122475991860188 + 3.1013235327705715*
          (-2 + 2*x) + 1.2911298641707138*(-2 + 2*x)^2) + 
       0.2154165016061856*(0.7543042473996161 + 1.7525434529558113*
          (-1 + 2*x))))/x^0.5008803972219025
 
sfitAll[40] = ((1 - x)^0.29998880657906785*(0.20551181971833443 + 
       0.2066230768723448*(1.4949798519049686 + 3.276798233698667*
          (-2 + 2*x) + 1.3710630893046725*(-2 + 2*x)^2) + 
       0.24784885744684668*(0.7505739775182955 + 1.8494036356398402*
          (-1 + 2*x))))/x^0.4505851709392276
 
sfitAll[50] = ((1 - x)^0.3305333773991985*(0.2291854033702962 + 
       0.22664510678047395*(1.5504262228862582 + 3.390550358704285*
          (-2 + 2*x) + 1.4219876498523225*(-2 + 2*x)^2) + 
       0.26974765091498254*(0.7513891749063366 + 1.9096775798920604*
          (-1 + 2*x))))/x^0.4208557975071381
 
fitMassSquared = -0.17959798072993982 + 19.910598034026645/k^2 - 
     4.443333990208367/k - 0.006238855759253004*k + 0.3234239036795359*Log[k]
