[MRTG] How can I graph often stationary values?

[Statistics MRTG]

Hi there mrtg folks,

MRTG graphs my moving values like CPU load average, etc, but
a similar script & config did graph disk space used until the figure
stopped changing, ie disk.sh echo'd
74
74
1 day 19:53

74
74
dns0.rotting.cheese.org .. 1 day 19:57 ... 1 day 20:02 etc
And mrtg just stopped graphing it! The graph has values for Mon Tues (while disk space was changing and none for lastnight and today) Wed does notappear on the graph but the script is "working"

How can I force it to graph stationary values?

pat

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