Looks like an F grill from here. It's tough to tell from the scan as it looks a tad tall, I'm bad.. I never measure grills, I always count points. Maybe you can do the following to try and bring the grill out a bit?
Take a pencil tip, rub it on your finger tip until you have a nice buildup of graphite on your skin. Then, LIGHTLY and GENTLY rub over the grill area, you should see the grill clearly then.
An F grill is around 11-12 points by about 16-17.
It's not an E grill and a Z grill is 13 x 18 points. Don't go nuts, I'm sure it's not a Z grill, only 2 of those exist.
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