Hello, I am trying to measure and plot the optical path length of light propegating through a curved material using non-sequential mode. My goal is to be able to measure the distance of the path taken from the light source, through the material, and onto the detector in the far field.  

I have been attempting to gather this with the NSRA operand which has the ability to display this data (data 17) however, I have not been successful in plotting to the 1D universal plot. I have selected the x variable to be the location on the detector (x ½ width) and y variable to be the NSRA operand with the following settings: 

This however, leads to an error in the plot:

I am unsure if this is the best way to collect the optical path lengths of the system or if there is another way to measure this value using NSC mode. 

Thanks!