Purple Cloud

The above lines calculate several intermediate values used in the indicator's calculations. Here's a breakdown of each variable:

a1: Represents a modified Exponential Moving Average (EMA) of the high price series, subtracted by a Simple Moving Average (SMA) of the low price series.
a2: Takes the square root of the lowest value between the highest close price over the last 200 bars and the current close price, multiplied by a1.
b1: Represents a modified EMA of the low price series, subtracted by an SMA of the high price series.
b2: Takes the square root of the highest value between the lowest close price over the last 200 bars and the current close price, multiplied by b1.
c1: Represents the square root of a2 multiplied by b2.
These lines create multiple plots using the plot function. Each plot represents a displaced version of c1 by a certain multiple of the Average True Range (ATR) multiplied by a constant factor (0.1, 0.2, 0.3, etc.). The transparency (transp) is set to 100 for all plots.