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<br /> <br /> <br /> <br />y <br /> <br />-- <br /> <br /> <br />Instrumented twin-engine aircraft provide on-the-spot recording <br />of atmospheric data. such as temperature. winds. humidity, the <br />number of ice nuclei present and the speeds of cloud updrafts. <br />Photo P801-D-76109 (upper) and Photo P801-D-76108 (lower) <br /> <br />Figure 1-4. Instrumented aircraft <br /> <br />1-9 <br />