How to connotate options string

[Marc@uTS]

Hi there,

I´m just trying to display IV for an individual time period, for instance 45 days, below the price chart of my Thinkorswim desktop version.

This is my code:

declare lower;

input daysToExpiration = 45;

def iv = Imp_Volatility(GetSymbol(), daysToExpiration);

#def iv = Imp_Volatility(GetSymbol());   #If I do it like this then the IV is shown in the chart.

plot ImpliedVolatility = iv;

ImpliedVolatility.SetDefaultColor(Color.CYAN);
ImpliedVolatility.SetLineWeight(2);

But the chart is staying completely empty.

If I delete the parameter daystoexpiration from the code then the chart shows the default IV calculation value (I guess for options with 30 days to expiration) but that´s not what I want.

Does someone know how to display IV calculated on basis of options with 45 days to expiration?

Cheers,
Marc