Discrete cross-correlation function analysis curves. Top row: 8.0 GHz vs. 4.8 GHz, 15.0 GHz (UMRAO) vs. 8.0 GHz, and 37.0 GHz vs. 15.0 GHz (OVRO). Bottom row: 91.5 GHz vs. 37 GHz, 230 GHz versus 91.5 GHz, and 345 GHz vs. 230 GHz. The dashed red line corresponds to a Gaussian function fit of the DCF, the mean of which (τ) is used as a more accurate estimate of the peak position. The dashed gold curve denotes the 99.7% confidence band.