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We provide, for any , lower and upper bounds on the maximal density of a packing in the Euclidean plane of discs of radius 1 and r. The lower bounds are mostly folk, but the upper bounds improve the best previously known ones for any
. For many values of r, this gives a fairly good idea of the exact maximum density. In particular, we get new intervals for r which does not allow any packing more dense that the hexagonal packing of equal discs.
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