+ double weight = (a[i].bn+a[i].an)*info->twofitweight/(a[i].an+1)+1.;
+
+ xb+=a[i].xb + a[i].xa * weight;
+ yb+=a[i].yb + a[i].ya * weight;
+ x2b+=a[i].x2b + a[i].x2a * weight;
+ y2b+=a[i].y2b + a[i].y2a * weight;
+ xyb+=a[i].xyb + a[i].xya * weight;
+ bn+=a[i].bn + a[i].an * weight;