What is the order of ionisation energies of the coinage metal?

Cu=3d104s1,Ag=4d105s1,Au=4f45d106s1 n all the above given cases, unpaired s-electron has to be removed. In the case of Cu, a 4s electron is to be removed which is closer to the nucleus than the 5s electron of Ag. So, IE1 of Cu>IE1 of Ag. However, in case of Au, due to imperfect screening effect of 14 e-'s of 4f orbitals, the nuclear charge increases and therefore 5s e- of Au is more tightly held.Thus, the order of IE1 is Cu > Ag < Au