#include <stdio.h>
#include <math.h>

float xtalkb(float ts);

float xtalkb(float ts)
{int i; float xtk;
float tcutl[30]={10.,15.,20.,25.,30.,35.,40.,45.,50.,55.,60.,65.,70.,75.,80.,85.,90.,95.,100.,105.,110.,115.,120.,125.,130.,135.,140.,145.,150.,155.};
float tcuth[30]={15.,20.,25.,30.,35.,40.,45.,50.,55.,60.,65.,70.,75.,80.,85.,90.,95.,100.,105.,110.,115.,120.,125.,130.,135.,140.,145.,150.,155,160.};
float xt[30]={0.1499,0.1394,0.1313,0.1251,0.1205,0.1151,0.1125,0.1060,0.1004,0.0920,0.0855,0.0786,0.0735,0.0674,0.0625,0.0554,0.0490,0.0428,0.0366,0.0306,0.0227,0.0157,0.0134,0.0113,0.0069,-0.0004,-0.0074,-0.0102,-0.0150,-0.0176}; 
 if(ts<10.){xtk=xt[0];return xtk;}
 if(ts>160.){xtk=xt[29];return xtk;}
 for(i=0;i<30;i++){
   if(ts>tcutl[i]&&ts<tcuth[i])xtk=xt[i];
 }
 return xtk;
}