what value does iCustom(..) method returns?

 
Hi,
It seems that iCustom() method returns a 'double' value.
Which value is it in iCustom() method? How do we set that value?

Kash
 
Custom Indicator can plot up to 8 lines. and all the index values are accessible - see dictionary
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mode - Line index. Can be from 0 to 7.
shift - shift relative to the current bar (number of periods back), where the data is to be taken from.
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Thank you.
Reason: