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Slicer allows to see slices of double differential observables, keeping one of the argument fixed. Also slicer allows to see the slice of double differential observables along any line you select pushing respective points at scattering plot of two arguments (plot at the left part). To see slice as a function of single argument, keeping second argument fixed, you should highlight "Line select" in the optional buttons at the bottom. After you should determine variable which should be argument of slice and determine fixed value of the second argument, selecting line on the scatter plot on the left part. After that you retrieve slice on the right part. To see slice along any line at the scatter plot not parallel x or y axis de-activate button "Line select". Pushing the point at the scatter plot on the left determine the line you want. On the right part you will obtain slice along selected line.