log (ICO(2−1)) versus log(ICO(1−0)) for the galaxies observed by us. Spiral galaxies (T ≥ 1) are shown as filled squares and early-type (T ≤ 0) as crosses. Red symbols indicate upper limits in either ICO(2−1) or ICO(1−0), and black symbols are detections. The y = x line is plotted as reference and does not represent a fit to the data.
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