[Yosemitest]

Can you tell me how to read figure 4 on page 6 of this .pdf ?
I want to know the sizes of those particles in real numbers.
I'm guessing the "radius (m)" is meters.
But I don't understand "log10(radius(m)" or "All Weighted: Ten bins per decade of radius(m)"

[Errant]

Can you tell me how to read figure 4 on page 6 of this .pdf?

Sorry but no. I don't know what they mean by ""All Weighted: Ten bins per decade of radius(m)" either... lol

What their model deals with is an estimated amount and size of small grains of 'dust' from a comet's nucleus, forming a trail affected by solar wind and gravity. What it doesn't appear to deal with (at least I have not seen where it attempts to) is larger debris from jetting, spin inertia, tidal force, or long term CME/Solar 'wind' effects from a comet that has 'broken up'.

[Errant]

Ooops, I was meaning to say above: NASA was forthcoming with data on the asteroid that recently missed the earth by half the distance of this comet's closest approach.

To be more precise, that asteroid was about 300' in diameter and missed earth by 3M miles on the 17th Feb., IIRC. This comet will pass about 5M miles and is a whole lot larger I believe.