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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />,I <br />I II <br />I <br />I <br />I <br />II <br /> <br /> <br />Figure 3. - Height contour pattern at the 500 millibar pressure level as <br />wave type Al develops. <br /> <br /> <br />-~~ <br /> <br />Figure 4. - Height contour pattern at the 500 millibar pressure level 24 <br />hours after that in figure 3. <br /> <br />19 <br />