Data set of the PACS imaging camera in the blue band in the transparent mode. This set consists of two cross-scans. The offset has been removed. All pixels have been reordered into a vector shape and displayed as a function of time (so that each pixel is shown as a horizontal line). Horizontal structures are the drift of the offset. The discontinuity in the offsets at the center of the figure comes from the temporal gap between the two cross-scans. An unstable line (pixels 176 to 192) results in frequent intensity discontinuities along both scans. At time index 45 000 the additional drift is due to a cosmic ray hit in the multiplexing electronics affecting a whole line. Finally, the faint vertical structures are due to the bright galaxy nucleus passing in front of the detectors.