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The identification of the NO$^+$ $J$=2--1 line is supported by new laboratory measurements of NO$^+$ rotational lines up to the $J$=8--7 transition (953207.189\\,MHz), which leads to an improved set of molecular constants: $B_0 = 59597.1379(62)$\\,MHz, $D_0 = 169.428(65)$\\,kHz, and $eQq_0(\\textrm{N}) = -6.72(15)$\\,MHz. 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