if(ac_distr==1) strcpy(file,"carbon_in_av.plot");
if(ac_distr==2) strcpy(file,"carbon_in_cv.plot");
if(ac_distr==3) strcpy(file,"carbon.plot");
if(ac_distr==1) strcpy(file,"carbon_in_av.plot");
if(ac_distr==2) strcpy(file,"carbon_in_cv.plot");
if(ac_distr==3) strcpy(file,"carbon.plot");