Change field's description on a chart plotted with rxbag, plotting dashed or dotted lines [closed]

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Hi,

I've got an existing bag-file I'd like to plot with rxbag. I'd like to change a field's description added automatically on the chart. Is there an easy way to do it, preferably without having to change the topic? Also, is there a way to plot dotted or dashed lines with rxbag (so that they are visible on a grayscale-printed paper as well)?

I've read this post, but I think it's something else meant there.

Regards.