improve graph recognition (about color?line?)

I'm really appreciate for the great tool, SourceTree, for windows.

but I have some difficulty or problem while using SourceTree graph section.

Actually I'm a colorblind, especially between green and red.
So, I cannot recognize the separate lines, dots on the graph easily .

if there something like shape(rectangle, triangle, start), dotted line, doubble line.. I can recognize and I will understand the graph more easily.

More than 1 percent of humans are color blind.