For the K-feldspar data, percent recovery values were calculated using Eq. 3 with the concentration of INSs in the high-density isolate in place of the concentration of INSs in the wash pellet. K-feldspar INSs were present in the high-density isolate with an average recovery of 54% (median = 49%, 25 th -75 th percentile = 15% -87%) (Figure and Figure ). The recoveries varied significantly between experimental replicates (see different symbol types in Figure ). This variability can be explained, at least in part, by inhomogeneity in the K-feldspar suspensions, which leads to variability from experiment to experiment (see discussion above).