If bid=1200.00, ask=1200.15, then spread is 15.
Depend on what your broker has to offer. I did not back test on Foexchief broker; XAUUSD spread is 12.0. So you should test using that spread value.
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Hello World .
Currently am back testing a strategy on MT4 for XAU-USD pair . can some one please tell me , what spread should be considered for XAU USD (gold) back testing ???