Several figures to illustrate the optical path of DESHIMA 2.0 at ASTE. (a) Sketch of the cryostat optics, warm optics, and ASTE Cassegrain setup. In addition to the optical elements, the hexapod, cryostat, support structures, and ASTE lower and upper cabin are also sketched. The warm focal plane is denoted ‘WFP’ and the warm optics ‘WO’ in this sketch. The drawing is not to scale. The Cartesian coordinate basis is illustrated in between the cryostat and warm optics. This is the standard coordinate system for the rest of this work, (b) Render of the lower cabin setup at ASTE. The warm optics are illustrated in orange. The cryostat and hexapod support structures are attached to the lower cabin ceiling at the blue surfaces. For reference, we again show the coordinate system from a), (c) Photograph of the ASTE telescope in the Atacama desert. The primary reflector M₁ and secondary reflector M₂ are indicated. The lower cabin is located underneath the primary mirror in between the mounting fork.