Extended trend - archive data

Extended trend - archive data

Hi,
I am trying to plot a historic trend for three tags. All three tags belong to the same archive.One tags value will be changing continuously(tag1) but the other two remains almost constant(tag2 and tag3).
When i see this trend in Runtime i can see that its plotting the tag1 but the other two tags value is not plotted. and when i enable the cursor i see the instantaneous value only for tag1 and other two tags are blank.
Is this because of some variable setting ? i am unable to find why the trend is not plotting these variables. Can you please suggest how to proceed?
TIA

This is a migrated post! Originally posted on 11.05.2015 by user kavya. Please be aware that information can be outdated.