V-band light curve of Z CMa with corresponding epochs of MATISSE observations (orange lines; dashed and solid for the quiescent and the outburst phase, respectively) as in Table B.1. Photometric data from the Archive of the American Association of Variable Star Observers (AAVSO; green circles), the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) Optical Monitoring Camera (OMC; magenta circles), and the Kamogata/Kiso/Kyoto Wide-field Survey of Variable Star Observers League in Japan (KWS; blue circles Maehara 2014). The imaging data were obtained during the outburst from late 2022 to early 2023. Also shown for reference are the epochs of archival ALMA and JVLA observations (purple lines; Takami et al. 2019).