Data not leaving FOR LOOP

Hi everyone,

I'm trying to create a program that would fit some PNG images of lasers beams. At each iteration of the FOR loop, I would select a new image, extract the data I need from it and then plot the data from each of these images in the same graph. But I can't understand why the data is not leaving the for loop.

Can someone please help me?

The VI and the image I'm trying to use to test it are attached. 

Thanks,

Yuri