In-Game FPS Counter Info

Does anyone know what the in-game FPS counter is displaying? I'm looking to know which number is the current FPS being drawn on the display? Is it the "cpu" or "gpu0," or a combination of both? Also, what does "sim" mean? I'm good on the "ms" and "mp/s" counters - just wondering what the cpu and gpu0 numbers are reporting in relation to one another.

I presented these questions to EA Help and they recommended I post here. Thanks in advance.