This grob function provides a general means of creating multiple grobs based on groups in the data. This is useful if you want to fit a separate smoother for each group in the data.
the plot object to modify
named list of aesthetic mappings, see details for more information
other options, see details for more information
data source, if not specified the plot default will be used
You will need an id variable in your aesthetics list with determines how the data is broken down.
Aesthetic mappings that this grob function understands:
x:x position (required)
y:y position (required)
any other grobs used by the grob function you choose
These can be specified in the plot defaults (see
aesthetics argument. If you want to modify the position
of the points or any axis options, you will need to add a position scale to
the plot. These functions start with
grob:grob function to use for subgroups
anything else used by the grob function you choose
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