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54 chapter 3Figure 3.4 Left: A plot of points as symbols with no line. Right: A plot of points as symbols withlines connecting the points and with error bars read from the file.8. Including error bars (Figure 3.4 left) is accomplished by placing them inthe data file read into Grace along with the data points. Under Data/ReadSets are, among others, these possible formats for Set type:(XYDX), (XYDY), (XYDXDX), (XYDYDY), (XYDXDXDYDY)Here DX is the error in the x value, DY is the error in the y value, and repeatedvalues for DX or DY are used when the upper and lower error bars differ;for instance, if there is only one DY, then the data point is Y ± DY, but if thereare two error bars given, then the data point is Y + DY 1 , −DY 2 . As a case inpoint, here is the data file for (XYDY):X 1 2 3 4 5 6 7 8 9 10Y 2 4 5 7 10 11 20 23 29 50DY 3 2 3 3.6 2.6 5.3 3.1 3.9 7 89. Multiple plots on one page (Figure 3.5 left) are created by starting at themain window. Thena. Select Edit/Arrange Graphs.b. An Arrange Graphs window (Figure 3.5 right) opens and provides theoptions for setting up a matrix into which your graphs are placed.c. Once the matrix is set up (Figure 3.5 left), select each space in sequenceand then create the graph in the usual way.d. To prevent the graphs from getting too close to each other, go back to theArrange Graphs window and adjust the spacing between graphs.−101COPYRIGHT 2008, PRINCET O N UNIVE R S I T Y P R E S SEVALUATION COPY ONLY. NOT FOR USE IN COURSES.ALLpup_06.04 — 2008/2/15 — Page 54