Hello. Curtain areas are taken the same in both directions in V7, (curtain areas) Curtain areas are taken depending on the angle in V8. Because of this (or any other reason) the V7 and V8 versions have different results. WHY WAS THIS FIXED IN THE V8 VERSION AS THE EARTHQUAKE REGULATION HAS NOT CHANGED? IN THIS CASE, WITH WHICH VERSION DOES OUR SOLUTION GIVE THE CORRECT RESULT? Unver ÖZCAN