Observations with the average image of L1527 subtracted out, December 2007–April 2014 displayed as inverse grayscale. The contour levels are −0.45, −0.35, −0.25, −0.15, 0.15, 0.25, 0.35, 0.45. Black areas are regions where the emission is brighter than the average and white areas are regions where the emission is fainter than the average. In this set of images the rotational character of the eastern lobe becomes more clear as the black and white flip from December 2011 to February 2013. The color bar shown in the lower right panel is in units of MJy sr⁻¹.