[Xymon] [xymon]repair rrd data

[diffusion at bulot-fr.com]

Hello

I have many ncv graph and they often "dotted" instead made of lines
It's like some data left in rrd : see attachment

* How to correct without loosing all data ? 
* how it's happened ? 

I had search for "rrd repair tools" but nothing seems works on my
server or PEBCAK ;-) 

(hope my english is not too bad)

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