I have 4 columns on a spreadsheet- sample ID, x value, y value, and series (of which there are three). I sort the columns based on series so I can group the data to graph, but I have to resort based on sample ID (to put them back in order). When I do this, the graph data is linked to the cells rather than the data that I originally thought I linked it to. I don't really know how to solve this problem, so any help would be greatly appreciated! Thanks!