PNG  IHDR;90PLTE@@@ftRNSS pHYsetEXtTitleInftyEditor MathImageytEXtAuthorAdministrator*tEXtDescription $ \bm{k}+\bm{1} $6?tEXtCopyrightInftyProject@$tEXtCreation Time r'rr'rr xIDATxQ 0`: Dxv3U,c| IKx1*˝˝Bdj=]`Ee/6%gӂuqLmFƦa?y|mMIENDB`