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Hmm don't know. Factored in tolerances maybe? At least they say "Fitting motor type" in the table.
As for the resistor. I couldn't find 0603 0.5W 0.15Ohm resistors anywhere either.
I guess I'll order some 0805 0.5W and some 0603 0.25W.
At least my board/drivers/resistors survived until now with standard resistors at ambient temperatures sometimes above 40°C while printing ;)
Checking with a thermal imager would be very cool :)