percent complete of AreaDone at any time are denoted by a
solid line for the mean value, and long and short dashes
respectively for the mean plus-or-minus 1-or-2 standard
deviations. Figure 4 (Top Right, Bottom Left, and Bottom
Right) shows the mean plus-or-minus 1-or-2 standard deviations
for the number of StagedSpool, and, as labeled, the standard
deviation (SD). Values were collected every 25 days.