r - How to control transparency (alpha) in ggplot violin plot's (dots) -

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the following image

enter image description here

is created following code:

library(ggplot2) library(plyr) library(reshape)  df<- structure(list(variable = structure(c(1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l, 1l), .label = "bcd.id.ln", class = "factor"),     value = c(1.133, 1.068, 1.01, 0.943, 1.048, 1.053, 0.999,     1.014, 1.149, 1.068, 0.898, 1.008, 0.976, 1.029, 0.95, 0.986,     1.102, 1.007, 1.08, 1.219), fc_log = c(0.180147861158429,     0.094911647025467, 0.0143552929770701, -0.0846703239869906,     0.0676387168753633, 0.0745054363636298, -0.00144341686966872,     0.0200576523412535, 0.200378797984026, 0.094911647025467,     -0.15521264992094, 0.0114956388378294, -0.0350469470992008,     0.0412429822318813, -0.0740005814437769, -0.0203404482841755,     0.140124223909071, 0.0100636833446975, 0.111031312388744,     0.285698125958125), len = c(26654l, 26654l, 26654l, 26654l,     26654l, 26654l, 26654l, 26654l, 26654l, 26654l, 26654l, 26654l,     26654l, 26654l, 26654l, 26654l, 26654l, 26654l, 26654l, 26654l     ), ecd = c(0.77027838223156, 0.633263300067532, 0.462219554288287,     0.290425452089743, 0.577361746829744, 0.592744053425377,     0.431417423276056, 0.473737525324529, 0.791888647107376,     0.633263300067532, 0.203909356944549, 0.456929541532228,     0.367524574172732, 0.519246642155024, 0.3059953477902, 0.395137690402941,     0.713251294364823, 0.453365348540557, 0.663840324153973,     0.865123433630975)), .names = c("variable", "value", "fc_log", "len", "ecd"), row.names = c(na, 20l), class = "data.frame")      ggplot(df, aes(x = factor(variable), y=fc_log)) +     geom_violin(adjust=.5, trim=false, fill='#a4a4a4', color="darkred" ) +     geom_boxplot(width=0.1) + theme_minimal() +     ylab("log2(fold change)") +     xlab("")

as stated in image, how can make dots transparent?

use outlier.colour= geom_boxplot rgb , transparency argument ('alpha'):

geom_boxplot(width=0.1, outlier.colour=rgb(.5,.5,.5, 0.5) ) + theme_minimal() +

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