The mean bolometric temperature of the 16 sources with well-determined values is 44 K and the mean luminosity is 5.7 L sun , excluding two sources of considerably higher luminosity. The rest have no significant or consistent asymmetry. The same code was used to compare infall models to the observations in one source, L1527. The results were consistent with previous collapse models.
Further evidence is needed to establish that infall is taking place.
However, the predominance of blue asymmetries over red asymmetries is not naturally explained in outflow models, whereas it is expected in collapse models.