ethod=retrieve&_eid=1-s2.0-S0370269316305779&_mathId=si5.gif&_user=111111111&_pii=S0370269316305779&_rdoc=1&_issn=03702693&md5=755f07b8ecdea72ac1e161f0d70fbb4a" title="Click to view the MathML source">τeff=1.479±0.034 (stat)±0.011 (syst) ps.lank.gif">