SO₂/CO₂ maps recorded on October 5, 2012. Right: map obtained using the SO₂ line at 1345.28 cm^-1; middle: map obtained using the SO₂ doublet at 1345.12 cm^-1; in both cases, the CO₂ line at 1345.22 cm^-1 was used for comparison. Left: average of the two maps. Top: Oct.5, 16:55; bottom: Oct. 5, 18:35. In spite of the limited signal-to-noise ratio, due to poor atmospheric conditions, there is evidence for actual temporal variations on timescales less than two hours.