还可以选择其他曲线图来显示每秒执行的 I/O 总量，这也能体现通过 SSD 实现的改进。
Other graphs can be selected to show the total number of I/Os performed per second which will also indicate the improvement from SSDs.
如果不再指定其他项，gnuplot自动显示两个曲线图，从而它们可以互相区别——在诸如Windows和Xll的终端中，gnuplot使用不同的颜色。
If you do not specify anything else, gnuplot automatically displays the two graphs so that they are distinguishable from each other — in terminals like Windows and X11, gnuplot USES different colors.
您可以检查面形的投影曲线的表面，看看预测的曲线是否显示了预期想得到的表面形状。
You can check the surface shape by projecting curves to the surface and see if the projected curve shows the surface desired shape where it is projected.
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