10 to the -18 = -8
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10 to the -18 means northing.
It could be 10 add -18 = -9
or 10 subtract -18- = 28
or 10 the negative 18th power , which is 0.000000000000000001. but more usually written as 1.0 x 10^(-18). because of the large 'string' of zeroes.