Examples of continuum maps indicating the possible presence of mountain waves. Top: continuum maps recorded at 1345 cm⁻¹, probing the cloud top (62 km), on December 22 (left) and December 23 (right), 2016. On December 22, 2016, the SEP longitude was 157.3 E and the evening terminator longitude was 144.7 E. The black crosses indicate the position of Thetis Regio. Bottom: continuum maps recorded at 1345 cm⁻¹, probing the cloud top (62 km), on January 21 (left) and January 22 (right), 2017. On January 21, 2017, the SEP longitude was 233.1 E and the evening terminator longitude was 237.4 E. The black crosses indicate the position of Atla Regio.