Line segments in circle

I'm using 2006 on some legacy work and i noticed that the end view of a cylindrical shape it is made up of line segemnts rather then a smooth arc or circle. I did not see this in SW2011 or 2012. This is similar to what i use to see on ACAD parts but it had a regen which smothed the circle. Does SW2006 have a regen or is it something else?

Thanks,

Jim

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