Comparing the BBN predictions of Neff and with those from various CMB determinations: BBN D + He (red-filled triangle), BBN D + WMAP7 [38] (red open triangle), WMAP7 [38] (blue filled square), ACT [39] (green-filled pentagon), SPT [40] (purple filled circle), SPT + Clusters [40] (purple open circle), and WMAP7 + ACBAR + ACT + SPT [41] (black-filled hexagon).
