Examples of spectra obtained with APEX (upper panels) and at OSO (lower panels) for globulettes of different size. From left to right: RN 9 (small), 114 (medium), and 129 (large). Upper panels: the ¹²CO(3–2), ¹³CO(3–2), ¹²CO(2–1), and ¹³CO(2–1) lines are plotted in black, green, red, and blue, respectively. Lines from (2–1) transitions are drawn as curves, and from (3–2) transitions as histograms. Lower panels: ¹²CO(1–0) profiles (thick); ¹³CO(1–0) profiles (green, thin). The ¹³CO(1–0) lines are multiplied by ten (RN 9) or three (RN 114 and 129). RN 9 is identified with the narrow component at ~0 km s^-1, while the broader component at ~+2 km s^-1 comes from more extended gas. In RN 129 a “blue” wing is present in several lines.