diff --git a/qpms/cymaterials.pyx b/qpms/cymaterials.pyx
index e2ec8eb..1e3915b 100644
--- a/qpms/cymaterials.pyx
+++ b/qpms/cymaterials.pyx
@@ -162,9 +162,9 @@ lorentz_drude = {
                 (0.053*eh, 0.241*eh, 0.345*eh, 0.87*eh, 2.494*eh, 2.214*eh)),
         'Ag_py' :  # This should give the same results as 'Ag'; to be removed.
             LorentzDrudeModel(1, 9.01*eh,
-                (0.84, 0.065,0.124, 0.111, 0.840, 5.646),
+                (0.845, 0.065,0.124, 0.011, 0.840, 5.646),
                 (0, 0.816*eh,4.481*eh, 8.185*eh, 9.083*eh, 20.29*eh),
-                    (0.053*eh, 3.886*eh, 0.452*eh,0.065*eh, 0.916*eh, 2.419*eh)),
+                    (0.048*eh, 3.886*eh, 0.452*eh,0.065*eh, 0.916*eh, 2.419*eh)),
         'Au' : _CLorentzDrudeModel.link(QPMS_LDPARAMS_AU),
         'Ag' : _CLorentzDrudeModel.link(QPMS_LDPARAMS_AG),
         'Cu' : _CLorentzDrudeModel.link(QPMS_LDPARAMS_CU),