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Table 4

List of colour indices used in this work.

Colour index Left int. Right int. Cont. fit. range #AGB #Post-AGB #PNe
(μm) (μm) (μm)
[6.4]–[9.3] 6.25–6.55 9.1–9.5 112 0 0
[5.8]–[9.3] 5.7–5.9 9.1–9.5 0 35 50

[16.5]–[21.5] 16–17 21–22 16–22, 20–23 112 0 42
[14.95]–[21.5] 14.8–15.1 21–22 20–23 0 0 7 (a)
[18.4]–[22.45] 18.1–18.7 22.3–22.6 20–23 0 22 (b) 0
[18.4]–[22.75] 18.1–18.7 22.5–23 18.5–19 0 10 (c) 0
[17.95]–[23.2] 17.8–18.1 23–23.4 18–18.5 0 11 (d) 0

Notes. The table lists: name of the colour, left and right integration range, continuum fit range, and number of objects for which such the colour was obtained. (a) Sources with the 16–18 μm feature. (b) Weak or not present 21 μm feature. (c)Relatively strong 21 μm feature. (d)Strong 21 μm feature.

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