ner_tags: O O O O O O B-Organization I-Organization I-Organization B-Organization O O B-Grant I-Grant O O O O O O O O O B-Telescope I-Telescope I-Telescope O B-Location O B-Organization O O O O B-Organization O B-Organization O O O O O O O O O
tokens: This work was supported by the German Deutsche Forschungsgemeinschaft, DFG project number DFG STR645/7-1. This work is based on data obtained with the STELLA robotic telescopes in Tenerife, an AIP facility jointly operated by AIP and IAC. Detailed comments from an anonymous referee are also appreciated.