[Rivet] plotting of multi-weight curves in 3.0.0alpha1

[Christian Gütschow]

Dear Rivet authors,

thanks for providing a teaser release with multi-weight functionality. Very
nice, I’ve been playing around with it all morning and it’s working well so
far. :-)

However, I do have one comment concerning the plotting macros: It looks
like the different variations associated with a given prediction are
currently plotted with the same colour, where the nominal prediction is in
bold and the variations are semi-transparent.

Now, that makes sense for tuning plots where one is comparing different
generators and their variations, but this seems inappropriate in analyses
where one often just wants to look at the (one) nominal prediction and its
associated uncertainties.

I’m sure in these cases the users would prefer to change the line
colour/style of the variation curves and add them to the legend as well, so
that one can quickly identify the dominant systematic variation. It seems
the current macros are lacking the required functionality to achieve this,
but I can imagine that this sort of use case will be frequent enough that
we should provide some tools for this, no?

I guess it would already help a lot if we could specify line properties in
the plot file for certain curves/variations only, e.g. something like

# BEGIN PLOT /BLAH/*[MUR0.5_MUF1_PDF261000]
LineColor=blue
LineStyle=dashed
# END PLOT

What do you reckon?

Cheers,
Chris

-- 

 Dr. Christian Gütschow

 TU Dresden
 Institut für Kern- und Teilchenphysik
 Zellescher Weg 19
 01069 Dresden

 > at CERN: 104-02-C02
 > at IKTP: E17, ASB
 > chris.g at cern.ch
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