You need record the decay for every +50 points,(eg. 11550, 11600, 11650),
If Market closes at 11760 – record it in 11800.
Market open at 11830 – we need to consider only closing price not opening price,
Record what is closing @ EOD price even if its gapup open / gapdown open.
Anybody can correct me if am wrong or i understood wrong.