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Table 4

Pearsons’ correlation coefficient ρ between dust and Serkowski parameters kP, λmax of various LIPS sub-samples.

Parameter Sample kP λmax
q S –0.81 –0.84
MSP –0.39 –0.06
MS –0.70 0.11
M 0.36 0.10
LSP –0.25 –0.04
L –0.25 –0.01
S 0.85 –0.94
MSP 0.91 0.65
MS 0.51 0.52
M 0.24 0.03
LSP 0.74 0.53
L 0.26 0.01
S 0.22 0.95
MSP –0.27 0.81
MS –0.39 0.74
M –0.17 0.09
LSP –0.22 0.77
L –0.07 0.17

Notes. Strong correlations or strong anti-correlations are marked in bold. q is the exponent of the dust-grain size-distribution, is the minimum radius of aligned silicates, is the mean radius of aligned silicates. Samples are defined as follows. – S-sample: single-cloud sight-lines (Table 1). HD 210121 is excluded. For the correlation studies with λmax we consider only 6 stars with λmax ≤ 700 nm. M-sample: multiple-cloud sight-lines with 24 stars as of Table 1. – MSP -sample: stars belonging to the M-sample that have the ratio pmaxAV in the observed range of the S-sample, and either kP or λmax also in the range of the S-sample. The MSP-sample has a narrower range in the observing parameters than the S-sample. – MS -sample: M-sample that are in the observed range of the S-sample either in kP or λmax. – L-sample: LIPS objects that are not single-cloud cases, including 51 stars. – LSP -sample: L-sample that are in the observed range of the S sample in pmaxAV and either kP or λmax.

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