Upper-left: Naturally weighted continuum emission from RX J1131-1231 at 2.1 mm. Continuum emission from three of the lensed images and at the position of the lensing galaxy has been detected. The beam size is 0.41′′ × 0.34′′ at a position angle of 62 degrees east of north, and the rms noise level is 10 μJy beam⁻¹. Upper-right: Naturally weighted CO (2-1) integrated line emission (moment-zero) map for RX J1131-1231, showing an Einstein ring structure. The beam size is 0.44′′ ×0.36′′ at a position angle of 60 degrees east of north, and the rms noise level is 0.038 Jy beam⁻¹ km s⁻¹. Lower-left: Naturally weighted CO (2-1) intensity weighted velocity (moment-one) map for RX J1131-1231, showing the clear velocity dependent structure of the molecular Einstein ring emission. Lower-right: Naturally weighted CO (2-1) intensity weighted velocity dispersion (moment-two) map for RX J1131-1231, showing evidence for turbulent molecular gas regions with a dispersion between 10 and 50 km s⁻¹. The beam size of the moment-one and moment-two maps are the same as the moment-zero map. In each panel, the ALMA 2.1 mm continuum contours at the (− 3, 3, 6, 12, 24, 48, 96) × 10 μJy beam⁻¹ level are overlaid for reference.