I am trying to make multiple off-axis projection plots in the same figure, and I follow the example of http://yt-project.org/doc/cookbook/complex_plots.html#multi-plot-slice-and-projections

The example has these two lines:

slc = yt.SlicePlots(...)

slc_frb = slc.data_source.to_frb(...)

So I did:

proj = yt.OffAxisProjectionPlot(...)

proj_frb = proj.data_source.to_frb(...)

But I got this error:

AttributeError: 'OffAxisProjectionDummyDataSource' object has no attribute 'to_frb'

Can anyone tell me why and how to fix it?

Thanks,
Jingjing

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