As we've mentioned here and there, some of the low angle tracks are particularly hard to identify (or dismiss) due to their not being part of our training.
Oh gracious moderators - is it possible to see some examples of these tracks that appear to move across the screen from left to right (or vice versa) where they both ARE and ARE NOT a track? This might help us - okay at least me - to know for sure what to look for when the track is more visible than the particle.
As for examples of a something that is not a track that may resemble a low angle track, that might be difficult. There have been numerous objects posted that are long, straight 'items' that could be scratches, gouges or any number of things; but the low angle trajectory has a distinguishing characteristic in that the track stays in focus beneath the gel and, if you watch as you change the focus, it seems to 'tunnel' downward (eventually out of the frame). The other FOV where this track ends has also been posted elsewhere in the forums.
http://stardustathome.ssl.berkeley.edu/ ... =7559378V1
Near the right edge. This one is more subtle and flagged by only 2 other viewers out of 88, so I'd be interested in what people think about it. It looks like the particle has split on impact, with the larger fragment travelling slightly further. As far as I can tell both are slightly below surface based on focus on very small dust spots on the surface nearby.
I've seen four of five other convincing (to me) low angle tracks posted by others on several threads. Has anyone else noticed that they all show a fairly similar trajectory, appearing to have been travelling from lower left towards upper right? I presume this is the trajectory consistent with IDPs, hence the team comment on the top movie.
While the first movie clearly shows the focus layer move along the track when diving deeper into the gel and reach the dark spot at the bottom, the second movie shows two spots at the surface and the shadow reaching out from them appears do be lower than these spots and has no clear focus moving along.
Saying this, I would be proud if I had found the first one and I would have marked the second movie "no tracks"
While the first movie clearly shows the focus layer move along the track when diving deeper into the gel and reach the dark spot at the bottom, the second movie shows two spots at the surface and the shadow reaching out from them appears do be lower than these spots and has no clear focus moving along.
Sebastian, thanks for your comments. I agree that the second doesn't clearly show the 'track' moving down with the focus so you may be right that the features are on the surface.
The two "particles" in movie Id 7559378V1 are circa 5-6 focus bars lower than the two spots in the surrounding area to me - on very small steps though. I would say it is a tiny track running diagonal up from the left to the right.
But remember, these low angle tracks are not the ones we are really care for. Specially if we can see a dark spot at the end of the track. The interstellar particles are much smaller and therefor invisible in the movie. They can only be recognized by the damage they do to the gel.
