[R-meta] Help with Funnel plot

[De Simone]

Dear Dr. Viechtbauer and Team,

I have this question regarding funnel plot, is how to get gradient colors
for the background like the one attached
And again how to get different types of lines (solid vs interrupted) for
the Reference and confidence separately. The argument "lty" do both. Using
"shade" and "hlines" didn't help

funnel(res, main="Duration of analegsia", back = 12, xlab="Mean difference
(hours)", cex = 1.2,  lwd = 2, lty = "solid", mgp = c(2, 1, 0), font.main =
1, font.lab = 2, font.axis = 2)

Best,
Belinda

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