New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 637th installment in their series of digital spreadsheet magic tricks, you'll learn how to create a dynamic two data series line chart for blood pressures — how to look up a chart using defined names, a data validation list, and a formula using the INDIRECT function inside a picture of a chart.