Straight line fit through origin (0,0) or with zero intercept Merged

Line & curves function allows to add a straight line fit. However, there is no option to force this fit line through (0,0) origin or with zero intercept. Like the way we have such option in MS Excel or SAS JMP, this isnt available in spofire. 

Having such an option helps in comparing line fits/line slopes in cases where the lines are expected to start from origin. It gives the power to prove that two or more categories in a data set are have same or different trends and make a decision accordingly.

Lack of this is hindering the progress in many of our analytics projects and we had to rely on other softwares to do this as an intermittent approach