6. Acknowledgement

Development of SMILI has been financially supported by the following programs (in alphabetical order).

• Consejería de Economía, Conocimiento, Empresas y Universidad of the Junta de Andalucía (grant P18-FR-1769)

• Consejo Superior de Investigaciones Científicas (grant 2019AEP112)

• Japan Society for the Promotion of Science Postdoctoral Fellowships for Research Abroad

• MEXT/JSPS KAKENHI (grant Numbers 24540242, 25120007, and 25120008)

• NASA Massachusetts Space Grant Consortium

• National Radio Astronomy Observatory Jansky Fellowship program

• National Research Foundation of Korea: Global PhD Fellowship Grant (NRF-2015H1A2A1033752)

• National Science Foundation Astronomy and Astrophysics Grants (AST-1440254; AST-1614868; AST-1950348; AST-2034306; AST-2107681)

• National Science Foundation Research Experiences for Undergraduates program

• State Agency for Research of the Spanish MCIU through the “Center of Excellence Severo Ochoa” award to the Instituto de Astrofísica de Andalucía (SEV-2017-0709)

• Spanish Ministerio de Economía y Competitividad (grants AYA2016-80889-P, PID2019-108995GB-C21)

• University of Science and Technology: the Overseas Research Exchange program

We also thank Michael Johnson, Andrew Chael, Katie Bouman, Chi-Kwan Chan, and many other EHT Imaging friends for fruitful discussions.