Put silica loss angle slope to 0

As was done in matgwinc some months ago

gwinc/ifo/Aplus/ifo.yaml

@@ -212,7 +212,11 @@ Materials:
     ThermalDiffusivitylown: 1.38  # Fejer et al
     Indexlown: 1.45
     Philown: 1.25e-5              # silica mechanical loss
-    Philown_slope: 0.4
+    Philown_slope: 0              # G1600641 and arXiv:1712.05701 suggest
+                                  # slopes between 0 and 0.3, depending on
+                                  # deposition method. Slawek's analysis in
+                                  # 10.1103/PhysRevD.98.122001 assumes zero slope.
+
 
   ## Substrate Material parameters--------------------------------------------
   Substrate:

gwinc/ifo/CE1/ifo.yaml

@@ -225,7 +225,11 @@ Materials:
     ThermalDiffusivitylown: 1.38  # Fejer et al
     Indexlown: 1.45
     Philown: 1.25e-5              # silica mechanical loss
-    Philown_slope: 0.4
+    Philown_slope: 0              # G1600641 and arXiv:1712.05701 suggest
+                                  # slopes between 0 and 0.3, depending on
+                                  # deposition method. Slawek's analysis in
+                                  # 10.1103/PhysRevD.98.122001 assumes zero slope.
+
 
   ## Substrate Material parameters--------------------------------------------
   Substrate:

gwinc/ifo/aLIGO/ifo.yaml

@@ -213,7 +213,10 @@ Materials:
     ThermalDiffusivitylown: 1.38  # Fejer et al
     Indexlown: 1.45
     Philown: 5.0e-5               # loss angle at 100Hz (was 4.0e-5)
-    Philown_slope: 0.4
+    Philown_slope: 0              # G1600641 and arXiv:1712.05701 suggest
+                                  # slopes between 0 and 0.3, depending on
+                                  # deposition method. Slawek's analysis in
+                                  # 10.1103/PhysRevD.98.122001 assumes zero slope.
 
   ## Substrate Material parameters--------------------------------------------
   Substrate: