Figure 1

An example of raw and reduced data obtained by our program. The lower panels show the first exposure of our ZFOURGE UDS mask obs100. The data has been processed through the calwebb_detector1 pipeline which has combined the raw frames of the exposure (ramp fitted). This was a 657 s exposure (similar to all exposures carried out by our program) and three of our quiescent candidates: ZF-UDS-4347, ZF-UDS-3651, and ZF-UDS-6496 were covered by this pointing. We have highlighted the positions of these three galaxies in the detector using white boxes. The continuum traces from our \(z>3\) galaxies can be clearly seen in this exposure. In the middle panel we have zoomed into the region in the detector which covers ZF-UDS-3651. The continuum of the object and the bar shadows from the MSA can be seen here. The upper panel shows the final reduced 2D image of ZF-UDS-3651. Three exposures of 657 s in three dither positions have been combined to produced the positive trace of this object which is optimally extracted and shown in Fig. 3.