An example field showing the original APEX/LABOCA maps from the ATLASGAL survey (left), the corresponding tile from Planck/HFI (middle) converted to 870 μm, and the combined map (right). The intensity scale is identical on the left and right panels going from 0.35 Jy/beam to 4 Jy/beam on logarithmic scale. Four arc-shaped, equidistant features bended to the Galactic plane are indicated in grey dotted lines and with arrows. Red crosses indicate the position of the velocity measurements from Wienen et al. (2012).