Hello R helpers,

I am producing a figure with dual strips, i.e., x~y | S1 + S2, where S1 and
S2 are two strips. For example, in figure 2.1 at
http://lmdvr.r-forge.r-project.org/figures/figures.html.

In this case, I would like to combine the the top strip, since all three
pictures in the same row have the same level based on the first strip. In
other words, instead of

| -- S11 -- | -- S11 -- | -- S11 -- |
| -- S21 -- | -- S22 -- | -- S23 -- |

I would like my graph to look like

| ----------------- S11 ---------------- |
| -- S21 -- | -- S22 -- | -- S23 -- |

In there a way I can do it?

Thanks!
JD

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