Errors in bmon.conf example

[cesare-brn]

bmon 4.0 from Debian
If you uncomment the section "element eth0" (obviously adapting the interface name), you'll get this error:
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/etc/bmon.conf:14: unexpected token '{'
Error while reading configfile "/etc/bmon.conf": parse error
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Removing the curly braces enclosing the value of "description", "rxmax", "txmax" and "max" resolve the problem.

However i still have to understand the meaning of "rxmax", "txmax" and "max": i guessed they was meant to set a fixed graph scale, disabling the automatic scale change. But the only change i can see setting these values is the creation of the RxMax/TxMax field in the information pane.
Please, can you clarify it, at least with a comment in the bmon.conf file?