According to the Minitab website, the bars represent each term in the regression equation, with their effect size in the model. In addition, the graph has a vertical line that shows a reference score, of which variables with values bigger than that are significant.

I believe the variable values are defined or related with T-Statistc (t) value computed for each model term, such as this. I came to that conclusion since they match perfectly in the number but not sign. The image below taken from example1, ilustrates that.

I still dont know where the standardize word come into effect, e.g. are the T-Statistics standardazied after being computed ? Also is standardized coming from effect size defintion or z-score conversion ?

I believe the reference score comes from the Student-T table critical values, since all the graphs I inspected so far have their values covered in the two-tail student-t table. Yet still unsure how they are being looked up e.g. how the degrees of freedom are being defined for each case.

Any help is appreciated.