Within the same night all three telescopes were used to observe in parallel for an effective combined mirror surface of nearly 160 square metres.
(all three telescopes; were used; to observe in parallel for an effective combined mirror surface of nearly 160 square metres; T:Within the same night) (all three telescopes; to observe; L:in parallel for an effective combined mirror surface of nearly 160 square metres)
all three telescopes all three telescopes
were used to observe
to observe in parallel for an effective combined mirror surface of nearly 160 square metres T:Within the same night
L:in parallel for an effective combined mirror surface of nearly 160 square metres