Darvas box thoery

can anybody explain me what is ath look period in darvas indicator in zerodha kite
@siva @nithin

Darvas box uses 52-week highs to construct the box on daily candle, It creates boxes when the price rises above the previous high. Darvas boxes can work on any timeframe for that you need to define parameters of look back period, ath look back period is number of candles that will allow to collect trade data for forming box.

you can read more about darvas box from this link

then about offset and ghost boxes