Here are just a few examples of Error Bar charts created using Chartz

You can convert between 2D and 3D with one click. Controls for 3D wall, depth, rotation, elevation, position and size are all conveniently located on one editor palette.
Bars can be of one color or multiple colors, just by toggling the "color each" checkbox. The errors can be shown in three styles, and with variable width, thickness and color.
As with vertical and horizontal bars, gradients and transparency can be applied.
And an additional line set or equation line can be added.
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