Top: sky positions for map points of an OTF map (obsid 1342210097) of IRC +10216 with the LO tuned to USB coverage of CO J = 5–4 in band 1b. The pluses represent the attitudes read from the PointingProduct and assigned to each spectrum data-set in the Level 1 pipeline. Two map cycles using half-beam sampling were carried out in this observation. The size of the beam (HPBW = 37.̋5) is shown in red. Bottom: map gridded into square pixels for the same observation. Each pixel is 19.̋5 × 19.̋2, i.e., not perfectly square because of overall pointing errors that do not average out in the entire map.