Undergraduate graduation design, the final result is to use a dat file output, the result of the experiment is two-dimensional data figure, with each point on the drawing many sets of data, the question now is, such as 1-9 selected zone, according to the final graphics only nine zone of a set of data, but I want all my zone of data should be combined, so that we can do it? And you can compare two error of the experimental results, and also with the colored two-dimensional figure intuitive expression comes out? Thank you ps: I really can't, before the software is used, and it is complicated