Percent of within-hours variance removed by normalization methods.

RA = Relative Abundance, FA = Factor Analysis. FA values show the range of 3 methods with differing score estimators – see Methods. Values shown are averaged over the compounds indicated. All variance reductions are significant at p<0.01 for each compound in group, except where indicated. ns = not significant. For all compounds and light conditions, the FA normalizations reduced variance significantly more than RA, except for 2-MeC24 and 2-MeC26 in LD.