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Changes between Version 3 and Version 4 of Questions_Durham_MDS_Testing

v3	v4
4	4	1) The width of the tracks removed by Magic are often extremely wide (10s of pixels). For example, in the 19 warped frames for skycell 077 in MD08 (g-band), between ~20-50% of pixel data in frames are masked out. What is the prospect of getting Magic working within the specification of only a few percent masked pixels? Note that bad read-out regions also result in large areas of individual frames being masked out.
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6		2) We have measured the PSF of the stacked images (g-band MD08) to have a width of up-to and over 2 arcsecs whereas the data distribution table ([PS1_Science_Processing_Status_20090705]) lists the image quality as 1.2 arcsecs. Why is it so bad (especially as the stack is made from only the 50% best data) and why is the quoted 1.2 arcsec wrong?
	6	2) We have measured the PSF of the stacked images (g-band MD08) to have a width of up-to and over 2 arcsecs whereas the data distribution table ([http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/PS1_Science_Processing_Status_20090705]) lists the image quality as 1.2 arcsecs. Why is it so bad (especially as the stack is made from only the 50% best data) and why is the quoted 1.2 arcsec wrong?
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