I have 4 tubes that I must graph values for. Each has 6 sets of data over a period of 10 minutes (in 2 minute intervals, starting from 0, then 2 min, then 4 min, then 6 min, then 8 min, and finally 10 min.) The 6 sets of data for the 4 tubes are readings of their absorbance on a spectrophotometer. The absorbance readings are placed on the y axis, and the time in placed on the x axis. I am having trouble getting 4 unique lines of data on the one graph, however. I would like to have a separate line for each tube. Please help, thanks.