A very simple thing that Excel can't do: plots with labels corresponding to data stored in a third column just on the left of the X values. To use easy labels, double click on a plot, and select a data series. then click on the Easy Labels button, and select the range where the labels are stored (in column). The number of labels should be equal to the number of values. Note: the format of the labels on the Excel sheet (color, size, ...) can optionally be copied to the chart.