It's about a 16degree swing from max timing. Starts at 0, goes to plus 8, then drops to minus 8.
An OEM cdi curve isn't far from that, goes from like ..plus 8 to plus 20ish and back. And they aren't all exactly the same. Varies from box to box.
You'll need a dial and degree wheel to compare the two
CottonBranchRacing