How do you produce an XMIM chart with the MEAN and 2 STD's above/below as constant lines?

%graph.back. Color: "black" %graph. Linetype: "MEAN" double_dash %graph.

Linewidth: "MEAN" 3 %graph.plot. Color: "MEAN" "red" %graph.axis. Color: "MEAN" "red" %graph.

Scalemin: "MEAN" -20 %graph. Scalemax: "MEAN" 25 %graph. Viewport: "MEAN" "0 0 100 100" %graph.

Linewidth: "2STDabove" 3 %graph.plot. Color: "2STDabove" "blue" %graph.axis. Color: "2STDabove" "blue" %graph.

Scalemin: "2STDabove" -20 %graph. Scalemax: "2STDabove" 25 %graph. Linewidth: "2STDbelow" 3 %graph.plot.

Color: "2STDbelow" "green" %graph.axis. Color: "2STDbelow" "green" %graph. Scalemin: "2STDbelow" -20 %graph.

Scalemax: "2STDbelow" 25 LET ATTR myMean = average from 59 days before SPX last_data_day to SPX last_data_day of 1 value % move of Close of SPX # this says grab the mean of the daily % moves for the last 60 days LET ATTR my2STD = standard_deviation from 59 days before SPX last_data_day to SPX last_data_day of 1 value % move of Close of SPX # this says calculate 1 STD using the last 60 days of daily % moves SHOW price_spx: ... more.

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