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