How does that qualify as a software bug? Perkin-Elmer&#x27;s custom null corrector was misaligned so the mirror was figured into the wrong shape. Edit: if anything, it was an organizational failure—PE chose to ignore other measurements that showed the mirror was the wrong shape.<p><a href="http:&#x2F;&#x2F;ntrs.nasa.gov&#x2F;archive&#x2F;nasa&#x2F;casi.ntrs.nasa.gov&#x2F;19910003124.pdf" rel="nofollow">http:&#x2F;&#x2F;ntrs.nasa.gov&#x2F;archive&#x2F;nasa&#x2F;casi.ntrs.nasa.gov&#x2F;1991000...</a>