[Xymon] Can't get data: distinguishing between icons

All -

Could someone please spell out for me the differences between the different icon displays indicating there's a problem getting data for a particular host / test?

No icon: (dash displayed in the given column)

Purple:

Clear:

Thanks!

david

David Mills
Systems Administrator
Northrop Grumman
512-595-1238
david.mills at ngc.com