An ellipse has 2 foci. They are the points of the major axis which are at distance $a$ from the intersection between the minor axis and the ellipse. The distance between the foci and the center is then called the linear eccentricity $f$.
Find Your Surgeon. Find Your Surgeon. The average cost of laser skin resurfacing is $2,222 for ablative and $1,113 for non-ablative, according to ASPS 2012 statistics. The cost of laser skin resurfacing may vary, and the aforementioned fees are the national average surgeon/physician fee only.ind Your Surgeon. The average cost of laser skin resurfacing is $2,222 for ablative and $1,113 for non-ablative, according to ASPS 2012 statistics.
1 Expect to pay a resurfacing contractor $3-$10 a square foot depending on the condition of the existing concrete, the resurfacing system used and local rates. 2  Small residential projects tend to cost more per square foot and may be subject to a minimum charge of $500-$1,000 or more. ThisOldHouse.com estimates it took two people five hours and six bags ($150-$180) of material to resurface a 9'x27' driveway and a 3'x18' walkway (about 300 square feet). 2  Renting a pressure washer to clean the existing concrete before resurfacing can add $40-$75 to the total DIY costs.