[R-meta] Help for funnel plot

[De Simone]

 Hi,
Excuse me for these silly questions
how do I get a colour gradient for the background like the one attached.
Colours are a bit limited
Any specific code for the type (solid vs interrupted etc) of the reference
line and pseudo confidence lines. I use "lty", but this do both at the same
time

Here is my argument

dat <- escalc("MD", m1i=Mean_TAP, sd1i= SD_TAP, n1i= N_TAP,
m2i=Mean_caudal, sd2i= SD_caudal, n2i= N_caudal, slab=Study, data=
Duration_of_analgesia)



res <- rma(yi, vi, data=dat, measure="MD", method="DL")


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)

Thank you

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