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* - Large particle dominated comet, t - Small particle dominated comet. - q > 5 AU comet. N.B.: All Qdust' D/G estimates are conservative, assuming minimum largest particle, with factor of +100% /-50% errors, with the dominant systematic uncertainty in the dust outflow velocity.

* - Large particle dominated comet, t - Small particle dominated comet. - q > 5 AU comet. N.B.: All Qdust' D/G estimates are conservative, assuming minimum largest particle, with factor of +100% /-50% errors, with the dominant systematic uncertainty in the dust outflow velocity.

Figure 2. Derived mid-infrared dust emission rate vs heliocentric distance for the 9 comets in our survey. There is a general trend of steeper slope and lower absolute emission rate for periodic comets versus new or long period comets. A possible selection effect that may affect the results is our ability to detect and observe fainter periodic comets due to their known positions and orbits - although the 4 comets from the COBE dataset were detected in an unbiased all-sky survey.

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