sfit[10] = (1 - x)^0.48584283080898677*x^0.3319325054816671*
     (0.3218932659671258 + 0.06349753318799259*(1.8467858743377252 + 
        4.745194724678746*(-2 + 2*x) + 2.299147981834984*(-2 + 2*x)^2) + 
      0.01515635090120347*(0.15391032532731969 + 2.817775336290654*
         (-1 + 2*x)))
 
sfit[12] = (1 - x)^0.4725002095042292*x^0.3366909325166047*
     (0.316047859436367 + 0.06975254793623192*(1.820378538247114 + 
        4.7091129483440834*(-2 + 2*x) + 2.2898910373088524*(-2 + 2*x)^2) + 
      0.01980994378313111*(0.13580927698762452 + 2.809191142020834*
         (-1 + 2*x)))
 
sfit[15] = (1 - x)^0.4250136861795415*x^0.30517626042940255*
     (0.2919452266682618 + 0.06724993212984264*(1.727838845989273 + 
        4.522880836288011*(-2 + 2*x) + 2.2055633730489226*(-2 + 2*x)^2) + 
      0.02696978592608358*(0.11983742575013895 + 2.730189946608944*
         (-1 + 2*x)))
 
sfit[20] = (1 - x)^0.43253640518666436*x^0.5451758829512611*
     (0.35253017166735506 + 0.08923502942768913*(1.7423484786858978 + 
        4.837964975126925*(-2 + 2*x) + 2.474988416917672*(-2 + 2*x)^2) + 
      0.022584284550952592*(-0.11263947776459671 + 2.9777122881379254*
         (-1 + 2*x)))
 
sfit[30] = (1 - x)^0.43889285492409486*x^0.8634605721132901*
     (0.44747503642921055 + 0.13275921769546448*(1.7546527514378536 + 
        5.246489516279835*(-2 + 2*x) + 2.8515748047722145*(-2 + 2*x)^2) + 
      0.02153911678448839*(-0.4245677171891952 + 3.3023534270373847*
         (-1 + 2*x)))
 
sfit[40] = (1 - x)^0.4532571824083778*x^1.2069404127128918*
     (0.5673937299618241 + 0.18453704872514032*(1.7826068103149575 + 
        5.716331610836753*(-2 + 2*x) + 3.297204902586917*(-2 + 2*x)^2) + 
      0.018473380785886492*(-0.753683230304514 + 3.6601975951212697*
         (-1 + 2*x)))
 
sfit[50] = (1 - x)^0.46296846053569024*x^1.4919996480512094*
     (0.6801249737507158 + 0.2379282969534568*(1.8016225885289288 + 
        6.101965087204858*(-2 + 2*x) + 3.6883346332125178*(-2 + 2*x)^2) + 
      0.01916715108934858*(-1.0290311875155191 + 3.9549681085868995*
         (-1 + 2*x)))
 
sfitAll[10] = ((1 - x)^0.33875562486008653*(0.09381090127341765 + 
       0.03862976358454148*(1.5655111239773036 + 3.2261702644549715*
          (-2 + 2*x) + 1.2962854096972107*(-2 + 2*x)^2) + 
       0.0631530375738298*(0.9186336396252976 + 1.7588776100948755*
          (-1 + 2*x))))/x^0.5798780147652112
 
sfitAll[12] = ((1 - x)^0.31069601101450195*(0.09768284232615874 + 
       0.039389878311105624*(1.5143100221519146 + 3.2052667963427566*
          (-2 + 2*x) + 1.3088693094023327*(-2 + 2*x)^2) + 
       0.06275151224785122*(0.84710515689048 + 1.7742868651385237*
          (-1 + 2*x))))/x^0.5364091458759781
 
sfitAll[15] = ((1 - x)^0.24402025199958838*(0.08396406248461184 + 
       0.03467049437803012*(1.3958033196923538 + 2.9971831310468486*
          (-2 + 2*x) + 1.2258629173525017*(-2 + 2*x)^2) + 
       0.06522408466923271*(0.8167783989659119 + 1.6712621050332648*
          (-1 + 2*x))))/x^0.5727581469663234
 
sfitAll[20] = ((1 - x)^0.20694138636578135*(0.09168754940819895 + 
       0.03779535856123818*(1.3318244482441677 + 2.977773538414045*
          (-2 + 2*x) + 1.247592218897621*(-2 + 2*x)^2) + 
       0.06604013085710347*(0.7153303265176558 + 1.6985524462139068*
          (-1 + 2*x))))/x^0.5083889401518744
 
sfitAll[30] = ((1 - x)^0.19612010962035079*(0.11590515294836948 + 
       0.05433044258934114*(1.3134117131292753 + 3.1051012017470967*
          (-2 + 2*x) + 1.3530368924891893*(-2 + 2*x)^2) + 
       0.06945028527646303*(0.5644338637095513 + 1.8278063555311501*
          (-1 + 2*x))))/x^0.3683137540892005
 
sfitAll[40] = ((1 - x)^0.17827546117983586*(0.1326528524875063 + 
       0.07032223366124296*(1.2833042617991954 + 3.159154125176934*
          (-2 + 2*x) + 1.4142610002854175*(-2 + 2*x)^2) + 
       0.07310049319528243*(0.4559497986929546 + 1.900601123666717*
          (-1 + 2*x))))/x^0.2776743375131187
 
sfitAll[50] = ((1 - x)^0.16363795104002926*(0.1470340152255389 + 
       0.08718977210112012*(1.2588456160703334 + 3.2015499003738084*
          (-2 + 2*x) + 1.4646928961065553*(-2 + 2*x)^2) + 
       0.07679046788672343*(0.3678621990297222 + 1.9594137030503365*
          (-1 + 2*x))))/x^0.20422424798969296
 
fitMassSquared = 0.2884081574812196 - 0.018843801931274218/k^2 - 
     0.6224854180168093/k - 0.03981135577203391*k - 0.3715266139153625*Log[k]
