ok, it seems the "study" i referred to early is a deduction made by mark levin in his book liberty and tyranny... he bases it of census data and their annual report on health care...
numbers from the report from 2007 (most recent i could find)
253.4 million with insurance
45.7 million uninsured
8.1 million under 18 uninsured in "poverty" (ie could qualify for various government programs for coverage. levins deduction, not mine.)
9.7 million are illegal (surprisingly 12.7 million illegals have some type of coverage)
9.1 million make over 75k a year (and could potentially buy insurance, again levin not me)
and then somehow he came up with a percentage of people who lost coverage for part of the year but got it back in the same year, but im not sure where he got it in the study or how he came up with that number.
so by his deduction theres only 25.5 million uninsured, of which 30% (7.65) are "between" insurance coverage. the other 20.2 million could be covered or are not entitled to coverage. so his uninsured number is more in the 17.85 million or so that are actually uninsured... i guess.
anyway, heres the report.
http://www.census.gov/prod/2008pubs/p60-235.pdf
edit for myke
the post you just did is mentioned in the study i just posted too, only with updated numbers and a different scale (and no graph

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2nd edit
based on your graph it looks like that graph goes through households that make up to 60k, which according to the report i posted accounts for about 41 million people (roughly, not exactly because the income breakdowns are different in my report) uninsured that make under 60k, which 91% of the uninsured in our country. (according to levin its really half that though), take it for what you will (and i know what youll take it for myke

)
The proportion of people not covered by health insurance is lower among people with higher income. In 2007, 24.5 percent of people in households with annual incomes of less than $25,000 had no health insurance coverage. Uninsured rates decreased for each consecutive household income group to 21.1 percent for households with incomes of $25,000 to $49,999, 14.5 percent for households with incomes of $50,000 to $74,999, and 7.8 percent for households with incomes of $75,000 or more. Among the four household income groups in Table 6, the uninsured rate was not statistically different in 2007 from 2006 in the lower three groups. The uninsured rate fell for people in households in the highest income group to 7.8 percent in 2007, from 8.5 percent in 2006.