The lines are from point milling. Ive never seen a map that I would call legitimate from either. Mapping compressors is very expensive and in most instances is mis-understood. Point milling is MFS also and has a longer cycle time and has advantages in some instances especially if you're trying to squeeze every last bit of potential out of a compressor. That potential is rarely realized since everyone thinks that bigger is better or the wheels are simply mis-matched with the turbine. If you want a point milled titanium wheel that can provide a very high mass flow potential let me know. If you have to ask the price it's not for you.