I want to add the following x-axis label to my bar plot but unfortunately R does not recognize the character '!' and prints dots instead of whitespaces:

```
 I want:                I get:
 !src x.x.x.x           X.src.x.x.x.x
 !TCP                   X.TCP
 !udp && !src x.x.x.x   X.udp.....src.x.x.x.x

```

Additionally a would like to increase the margin because the text is to long and when setting the size over 'cex.names=0.6' then it just vanishes!?