Understand that for Shimano cranksets, the usual Chainring spacing is 5mm and 8-speed chainrings are 2.38mm thick. But folowing figure shows that it can vary across cranksets.

Before I buy crankset FC-RS200, have to figure out the exact positions of and spacing between chainrings.
Need x1 and x2 as shown in following figure.






Above figure was posted by tomtomtom123 in
What's the chainring spacing on 10 speed double and triple cranks?