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Edge strength profile along a line using labview

I am trying to plot edge strength profile along a line using IMAQ Edge Tool 3 VI in labview. The gradient values array is coming out to be empty, however a edge is being detected. I am attaching the screenshot of front panel and block diagram of this VI.

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From the help manual:

Optimized Mode, when TRUE, enables a faster edge detection algorithm that does not return gradient values. When FALSE, enables a standard edge detection algorithm that returns gradient values. The default is TRUE

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