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The second sequence would use CDS in the same manner as above but with SUMER observing density dependent lines from O IV ] , S IV ] as well as Si IV at a high signal to noise ratio without the need for high temporal resolution , but instead attempting to extract densities as a function of projected Doppler velocity from the monochromatic intensities of density sensitive lines . In January , security researcher Neil Archibald , who has already been credited with finding numerous vulnerabilities in OS X , told ZDNet Australia that he knows of numerous security vulnerabilities in Apple 's operating system that could be exploited by attackers . ( Technically it looks for the Windows 95 operating system kernal routines in OS memory ) . A couple other shortcomings of OS X - - it has the Mach microkernel at it 's core , which is responsible for some well-known performance hits . We show how to recognize the polygons whose boundary can be covered by k such subpolygons in O ( k3m2k-2 + TM ( kmk-1 ) ) time , where TM ( n ) is the time required to multiply two n times n matrices ( currently known to be in o ( n2.376 ) ) .