Let
72X&_mathId=si1.gif&_user=111111111&_pii=S0022314X1630172X&_rdoc=1&_issn=0022314X&md5=6d1ee85e86958b1af9d9bc351bcb9e97" title="Click to view the MathML source">Ff∈Sk(Sp2n(Z)) be the Ikeda lifting of a Hecke eigenform
72X&_mathId=si2.gif&_user=111111111&_pii=S0022314X1630172X&_rdoc=1&_issn=0022314X&md5=de50eb9b7d2157433faaa8a5bc259e32" title="Click to view the MathML source">f∈S2k−n(SL2(Z)) with the normalization
72X&_mathId=si3.gif&_user=111111111&_pii=S0022314X1630172X&_rdoc=1&_issn=0022314X&md5=b085bb03163375a8f64a127572b3a707" title="Click to view the MathML source">〈Ff,Ff〉=1. Let
72X&_mathId=si4.gif&_user=111111111&_pii=S0022314X1630172X&_rdoc=1&_issn=0022314X&md5=3bdc385f6b6abc428ccef26234542b41" title="Click to view the MathML source">E(Z;s) denote the Klingen Eisenstein series. In this paper we verify that
which is predicted by the mass equidistribution conjecture of Cogdell and Luo
[CL].