一个分支(如图1中的蓝色矩形所示)是版本(蓝色圆圈)的一个线性序列。

A branch (shown as blue rectangles in Figure 1, following) is a linear sequence of versions (blue circles).

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对于新增的区别，plot - latlong程序需要经过修改才能绘制蓝色圆圈而不绘制红色方框。

For added differentiation, the plot-latlong program needs to be modified to draw blue circles instead of red boxes.

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根据程度不同，信息所显示的符号也不同(一个蓝色圆圈，一个黄色三角形，或者中间带一横杠的红色圆圈)。

Depending on the severity, a different symbol is shown for the message (a blue circle, a yellow triangle, or a red circle with a cross inside).

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