RINGO3 data of the standard zero-polarised star G191B2B and the unpolarised field star H. Top, middle, and bottom panels: results in the blue, green, and red bands, respectively. We depict the observing dates (vertical dotted lines) and when hardware updates occurred (vertical solid lines), as well as the Stokes parameters for G191B2B (filled circles and squares) and H (filled stars). The horizontal dashed lines represent average parameters of G191B2B (these would be equal to zero for an ideal instrument), and the horizontal dotted lines are the instrumental polarisation offsets reported in Jermak (2016).
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