Roassal Tip #2: Labeling bar with GraphET. 
You can use @RTLabelled for each bar elements. Consider the following example:

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| diagram |
diagram := GET2DiagramBuilder new.
diagram horizontalBarDiagram
models: #(10 12 13 200 150 -13 149 -151);
regularAxis.
diagram build.

"Pick the horizontal bars and add a label"
diagram view elements do: [ :e |
(e shape class == RTBox) 

ifTrue: [ e @ RTLabelled new right ]
].
diagram view open

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https://www.facebook.com/ObjectProfile/photos/a.341189379300999.82969.340543479365589/620580701361864/?type=1&theater

Cheers,

Alexandre

-- 
_,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:
Alexandre Bergel  http://www.bergel.eu
^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.

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