sfit[10] = (1 - x)^0.2618111010755085*x^0.3703115497169773*
     (0.4140258786611632 + 0.05523178765130234*(1.4269891779364479 + 
        4.107587666015124*(-2 + 2*x) + 2.10305470014904*(-2 + 2*x)^2) + 
      0.06124382613774467*(-0.1085004486414688 + 2.632122650792486*
         (-1 + 2*x)))
 
sfit[12] = (1 - x)^0.25470457694730053*x^0.2646695269869917*
     (0.38952143365116004 + 0.055125709794280484*(1.4144940761799023 + 
        3.9675744500652264*(-2 + 2*x) + 1.9881710234221994*(-2 + 2*x)^2) + 
      0.08548463882887174*(-0.009964950039691167 + 2.5193741039342923*
         (-1 + 2*x)))
 
sfit[15] = (1 - x)^0.25211969796845857*x^0.24550888512620886*
     (0.3983057290217595 + 0.05388489805361122*(1.4099617180045412 + 
        3.9385391140825052*(-2 + 2*x) + 1.9663792860469347*(-2 + 2*x)^2) + 
      0.10691417132777567*(0.006610812842249708 + 2.4976285830946674*
         (-1 + 2*x)))
 
sfit[20] = (1 - x)^0.26622640726732316*x^0.3766083071465775*
     (0.47958348193656053 + 0.05272319447062818*(1.4347778608642179 + 
        4.1277441135574495*(-2 + 2*x) + 2.1141349338691136*(-2 + 2*x)^2) + 
      0.12364525665061969*(-0.11038189987925434 + 2.6428347144139006*
         (-1 + 2*x)))
 
sfit[30] = (1 - x)^0.2894289223208781*x^0.38435165060420745*
     (0.5427434259891802 + 0.07368009417840027*(1.4760279340192295 + 
        4.205429748957628*(-2 + 2*x) + 2.146305533865857*(-2 + 2*x)^2) + 
      0.16907842237407422*(-0.09492272828332937 + 2.6737805729250854*
         (-1 + 2*x)))
 
sfit[40] = (1 - x)^0.30389366222428377*x^0.39065499172328644*
     (0.5903226600494803 + 0.10428156799236821*(1.5020161723064693 + 
        4.255923614304533*(-2 + 2*x) + 2.1680298012916714*(-2 + 2*x)^2) + 
      0.20014007943507794*(-0.08676132949900267 + 2.69454865394757*
         (-1 + 2*x)))
 
sfit[50] = (1 - x)^0.31436513858793264*x^0.5284238757308586*
     (0.6976101348208088 + 0.12451004264540563*(1.520960428061604 + 
        4.446808464844048*(-2 + 2*x) + 2.326227052860997*(-2 + 2*x)^2) + 
      0.20902529391828722*(-0.21405873714292595 + 2.8427890143187913*
         (-1 + 2*x)))
 
sfitAll[10] = ((1 - x)^0.21574751304522177*(0.15293110385710867 + 
       0.08626775996042924*(1.3468947642604316 + 3.0374091410014326*
          (-2 + 2*x) + 1.28229200211514*(-2 + 2*x)^2) + 
       0.12164487247163723*(0.6898386567445005 + 1.741656369345943*
          (-1 + 2*x))))/x^0.4740911436992787
 
sfitAll[12] = ((1 - x)^0.1717298311990992*(0.10945101233600711 + 
       0.09215811102194228*(1.2723403142604843 + 2.7724674535438236*
          (-2 + 2*x) + 1.1340298951673022*(-2 + 2*x)^2) + 
       0.13638240818081818*(0.7902254490862851 + 1.5532342133119135*
          (-1 + 2*x))))/x^0.6184956178871859
 
sfitAll[15] = ((1 - x)^0.20807671316244805*(0.14384813353570997 + 
       0.10651574712057069*(1.333763029023916 + 2.971809949345797*
          (-2 + 2*x) + 1.2421691343582726*(-2 + 2*x)^2) + 
       0.1517449802783527*(0.7243901088362418 + 1.6917633174886542*
          (-1 + 2*x))))/x^0.5163133956737938
 
sfitAll[20] = ((1 - x)^0.22289238350328291*(0.1692973929020288 + 
       0.12459507422200865*(1.3591790825668117 + 3.0685550194063866*
          (-2 + 2*x) + 1.297906630251939*(-2 + 2*x)^2) + 
       0.17406797456768*(0.6849178512899012 + 1.7608669157166643*
          (-1 + 2*x))))/x^0.46202546778661835
 
sfitAll[30] = ((1 - x)^0.2513249120268771*(0.23223812230008514 + 
       0.15186470234618044*(1.4085694737429741 + 3.279417064539127*
          (-2 + 2*x) + 1.4250957835319813*(-2 + 2*x)^2) + 
       0.20838047340922447*(0.589327942329757 + 1.9133218817239972*
          (-1 + 2*x))))/x^0.33800303030287987
 
sfitAll[40] = ((1 - x)^0.2615704949902495*(0.2833960589665773 + 
       0.17007274353668672*(1.4265653044100963 + 3.4061634733809227*
          (-2 + 2*x) + 1.5107030401187467*(-2 + 2*x)^2) + 
       0.23177740765200686*(0.5109302444599552 + 2.012210745520544*
          (-1 + 2*x))))/x^0.2493597494697057
 
sfitAll[50] = ((1 - x)^0.2620436755701154*(0.3304380705833112 + 
       0.181663228768953*(1.427398957308321 + 3.498553216812686*(-2 + 2*x) + 
         1.5826965144671934*(-2 + 2*x)^2) + 0.24753487216551584*
        (0.4308197413263517 + 2.093267609813879*(-1 + 2*x))))/
     x^0.16877606575623633
 
fitMassSquared = 0.1938216019493156 + 9.588074716240127/k^2 - 
     2.9474159800975333/k - 0.011873126834583421*k - 
     0.00845009639940476*Log[k]
