SOLVED: 

Took some css digging, but it seems a stylesheet from a component for 
the web application I am working with was overriding some css 
attributes of the tables making up the annotated timeline display. 
Placing the following code in the <style> block at the top of my 
template page fixed the problem for me. 

table.annotatedtimelinetable tbody td { padding:0px; border-top: 
none;} 

- 隐藏引用文字 -
  > > Thanks much!

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