0.00067小数点后是5位,所以-1.2/100,000 = -0.000012
0.00067-0.000012=0.000658
Notes第二本书,211页
There is a myth that the forward points are always divided by 10,000. That is only true
if the spot quote is given to four decimal places. To continue the pattern, if the spot
quote shows five decimals on the right, move the forward point decimal five places
( /100,000) to the left.