Change Additional Images per Row from 2 to 3

I want to make it that 3 images are shown in each row of my additional images. Right now I see 2 per row. Does anyone know what I should change to show each row of additional images with 3 images across instead of 2?



I think the code is somewhere on product_images.tpl but I can’t figure it out.



Thanks!!

Regards,

Stephanie

2.0.7