You sure Jim? I thought the conversion was F=(9/5*C)+32. The lines intersect at 212F=100C. 212F=(9/5*100C)+32 is true so 45F=(9/5*7C)+32. Mark P >Actually it is about 13 deg. F difference. >80 deg. C = 176 deg. F >87 deg. C = 189 deg. F >Jim Dupree