Spectral comparison between the standard unclumped model set and the clumped counterpart in which we enforced a uniform volume filling factor of 20% only in the ejecta layers that are O rich (i.e., those layers corresponding to the O/Si, O/Ne/Mg, and O/C shells in the progenitor). The significance of the changes varies from model to model, but typically we see enhancements in [O I] λλ 6300,  6364, [Mg I] λ 4571, Ca IIλλ 8498 − 8662, and to a lesser extent in [Ca II] λλ 7291,  7323 and Na Iλλ 5896, 5890, and a small reduction in the Fe flux. Models he8p0 and he12p0 are omitted.