Comparison of experimental measurements of exponential and linear growth. (a) Plotting of exponential and linear growth over one doubling shows that the lines are quite similar (circles, linear; squares, exponential). (b) Adding of small variations up and down to alternate exponential points shows that the lines for exponential and linear growth are very similar. (c) Removing the connecting line and looking at only the data for the varied exponential line shows that one cannot eliminate exponential growth by a straight line on rectangular coordinates. (d) Comparison of differential measurements of growth showing that one can distinguish between exponential growth and linear growth using differential measurements.