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STELLA (for Stellar Activity) is a pair of 1.2-meter robotic telescopes at Roque de los Muchachos Observatory (ORM) in the Canary Islands carrying out research on stellar activity. Each telescope hosts one instrument: STELLA-I hosts SES (STELLA Echelle Spectrograph) and STELLA-II hosts WiFSIP (the FOV STELLA Imaging Photometer). Future plans are to add more spectrographs to STELLA-I.