MMZ did you check the Maxim guides to trace width? There's a pdf about improving accuracy w/ diode-based solutions on their site and they give some guidelines. With length so short (and with header there anyway) it shouldn't be a big deal but might be worth perusal. That 0.125C bit is a big deal though for some. I bought $100 MAX6655EVSYS purely because they had software that did 1/8C
And of course that software only works over parallel port using their SMBus to Parallel adapter...
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