Kindly please post this AFL code if anyone has...

Hello Friends,

If anyone has this AFL, kindly please share. Thanks for your help.

It looks like a Donchian channel or if not this should get you going:

upperChannelLine = HHV( Ref( H, -1 ), 13 );
lowerChannelLine = LLV( Ref( L, -1 ), 13 );
Plot( upperChannelLine, "Upper Donchian", colorDonchian );
Plot( lowerChannelLine, "Lower Donchian", colorDonchian );