LOH Measurements to Include (100K or 500K Arrays) Select loss of heterozygosity (LOH) columns to include in the Output Data Set . Measurements with asterisks ( * ) are included for paired analysis only. Measurements with double asterisks ( ** ) are included for unpaired analysis only. For more information about these measurements, refer to Affymetrix documentation . To Select LOH Measurements to Include in 100K or 500K Arrays: Left-click a single measurement, or hold down Ctrl while left-clicking to select multiple measurements.