The graph in Fig. 6 contains the same data as the graph in Fig. 5. In Fig. 6, the data variables are shown as dashed lines.
Figure 6. Effect of spermidine on the transformation of B. subtilis BR 151. (Mol. Gen. Genet 178:21-25, 1980; courtesy of Franklin Leach; redone in DeltaGraph Pro courtesy of B.T. Glenn.)
Fig. 7 is the same graph with the x-axis grid shown in light gray so as not to confuse the grid with the important data indicators. If you wish to include gridlines for clarity, set them 1 point thick on a 15% gray. However, the gridlines in Fig. 7 give the graph a very cluttered appearance.
Figure 7. Effect of spermidine on the transformation of B. subtilis BR 151. (Mol. Gen. Genet 178:21-25, 1980; courtesy of Franklin Leach; Redone in DeltaGraph Pro courtesy of B.T. Glenn.)