In columns A and B I have a set of x,y datapoints, and in column C is either 1, 2 or 3 indicating the dataset where a given x,y pair lie. Is it possible to import these 3 columns at one go so that all the x,y pairs falling in dataset 1 are plotted in red, those in dataset 2 in blue and the x,y pairs in dataset 3 plotted in green?