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<br />l <br />--j <br />, <br />\ <br />-----=-::;!. <br /> <br />" <br /> <br />essential that the selected size be convenient to use. <br />It is also good practice to establish criteria for plotting <br />data. A useful procedure is to plot all cross sections from left to <br />rigilt facing downstream, have the upstream cross section at the bottom <br />of the paper, and have the cross sections plotted in sequence with <br />the most downstream section located at the top of the paper. This <br />gives the sensation of standing and looking in the downstream direc- <br />tion, and is a valuable aid in perceiving the 3-dimensional boundary <br />geometry that must be described digitally or analytically. <br /> <br />" <br />~ <br /> <br />I, <br />1 <br />1 <br /> <br />4.19 <br />