How to sum correlation, or, calculate correlation of disjointed variables

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I'm trying to calculate the correlation of 2 array of variables, but the array is disjointed in the middle - but I'm trying to obtain one correlation coefficient

See the excel file I uploaded:

[question]http://www.speedyshare.com/pdzDX/Correlation-question.xlsx

because the disjoint in the middle, there is somewhat a jump in value and when I correlate the whole set of variable together I obtain a correlation coefficient that is not really reflective of the relationship between the variables

How would I be able to calculate one correlation coefficient? I can calculate two separate correlations but is there anyway to sum 2 correlation together?