New Mexico (34 N) and Colorado (40 N)

These are monthly averaged, normalized data (average of about 50 measurments/month). Each measurement is normalized by taking the ratio of the OH column abundance to the average measured value for the period 1980 to 1988 from Fritz Peak Colorado for the respective time of day. The latter point is important because OH amounts vary by more than a factor of two between early morning/late afternoon and noon (see mean diurnal behavior for 1996).

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