Observed spectrum of IRC+10216 between 18.0 GHz and 32.3 GHz using the new K/Ka-band receiver of the Yebes Observatory. The data have been gathered in wobbler switching and are shown without any baseline subtraction. A box car smoothing of six channels has been applied. The ordinate is the antenna temperature corrected for atmospheric and telescope losses in milli-Kelvin. The different panels show the same data but with different intensity scale. The abscissa is the rest frequency; i.e. it was frequency-corrected for a v_{LS R} velocity of −26.5 kms⁻¹ (Cernicharo et al. 2000). Observing time between 18 GHz and 26 GHz is 12 hours and it is 10 hours for data above 26 GHz. Frequency ranges with severe RFI for IRC+10216 are 18.00–18.30, 18.80–19.30, 22.05–22.15, 23.01–23.06, and 24.12–24.25 GHz. They are indicated by red horizontal lines. Despite the intense interferences in these frequency ranges, strong astronomical lines are easily detected.