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<p><strong>Abstract.</strong> Analysis is made of the accuracy of magnetic-observatory hourly means constructed from definitive minute data having missing values (gaps). Bootstrap sampling from different data-gap distributions is used to estimate average errors on hourly means as a function of the number of missing data. Absolute and relative error results are calculated for horizontal-intensity, declination, and vertical-component data collected at high, medium, and low magnetic latitudes. Fordoi:10.5194/angeo-27-3601-2009 fatcat:75vpxtp6qfdv7bag4hunerxtde