why is the Aroon indicator is not showing "0" level at the bottom ? any settings to be done? pl help,.

I am trying to see the Aroon indicator. It is not showing the "0" level at all, the bottom is always above "0". for eg., if i use 10 period setting ... it showing "10" as min, if i use 20 periods .... then i get "5" at the bottom level. does anyone know how to fix it?
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