Graphing Network Bandwidth Totals

[farside]

I am trying to graph our Internet bandwidth totals, to compare against ISP figures, using the Interface - Traffic (bits/sec. Total Bandwidth) graph template.
If I turn on debugging I see ERROR: Garbage ': 827.13 MB\n' after command: and no graphs are created. Is there something I am missing ?
Is there a better way to achieve this ?

Thanks in advance

[gandalf]

Please visit that graph at Graph Management and switch to DEBUG. Post the resulting rrdtool graph statement
Reinhard