diff --git a/likelihoods/act_dr6.yaml b/likelihoods/act_dr6.yaml
index 6291be4..a282fa0 100644
--- a/likelihoods/act_dr6.yaml
+++ b/likelihoods/act_dr6.yaml
@@ -191,6 +191,10 @@ act_dr6_mflike.ACTDR6MFLike:
       value: 0.0
       latex: \alpha_{\rm tSZ}
 
+    calG_all:
+      value: 1
+      latex: \mathrm{A}_{\rm Planck}
+
     cal_dr6_pa4_f220:
       value: 1
       latex: \mathrm{c}_{\rm pa4}^{\rm f220}
diff --git a/likelihoods/act_dr6_eeonly.yaml b/likelihoods/act_dr6_eeonly.yaml
index 08cb8ba..87d59d2 100644
--- a/likelihoods/act_dr6_eeonly.yaml
+++ b/likelihoods/act_dr6_eeonly.yaml
@@ -133,6 +133,10 @@ act_dr6_mflike.ACTDR6MFLike:
       value: 0.0
       latex: \alpha_{\rm tSZ}
 
+    calG_all:
+      value: 1
+      latex: \mathrm{A}_{\rm Planck}
+
     cal_dr6_pa4_f220:
       value: 1
       latex: \mathrm{c}_{\rm pa4}^{\rm f220}
diff --git a/likelihoods/act_dr6_polcuts.yaml b/likelihoods/act_dr6_polcuts.yaml
index 7882be8..0eaab17 100644
--- a/likelihoods/act_dr6_polcuts.yaml
+++ b/likelihoods/act_dr6_polcuts.yaml
@@ -191,6 +191,10 @@ act_dr6_mflike.ACTDR6MFLike:
       value: 0.0
       latex: \alpha_{\rm tSZ}
 
+    calG_all:
+      value: 1
+      latex: \mathrm{A}_{\rm Planck}
+
     cal_dr6_pa4_f220:
       value: 1
       latex: \mathrm{c}_{\rm pa4}^{\rm f220}
diff --git a/likelihoods/act_dr6_teee.yaml b/likelihoods/act_dr6_teee.yaml
index e17db63..6d3998e 100644
--- a/likelihoods/act_dr6_teee.yaml
+++ b/likelihoods/act_dr6_teee.yaml
@@ -148,6 +148,10 @@ act_dr6_mflike.ACTDR6MFLike:
       value: 0.0
       latex: \alpha_{\rm tSZ}
 
+    calG_all:
+      value: 1
+      latex: \mathrm{A}_{\rm Planck}
+
     cal_dr6_pa4_f220:
       value: 1
       latex: \mathrm{c}_{\rm pa4}^{\rm f220}
diff --git a/likelihoods/act_dr6_teonly.yaml b/likelihoods/act_dr6_teonly.yaml
index 5953d0c..47802bf 100644
--- a/likelihoods/act_dr6_teonly.yaml
+++ b/likelihoods/act_dr6_teonly.yaml
@@ -139,6 +139,10 @@ act_dr6_mflike.ACTDR6MFLike:
       value: 0.0
       latex: \alpha_{\rm tSZ}
 
+    calG_all:
+      value: 1
+      latex: \mathrm{A}_{\rm Planck}
+
     cal_dr6_pa4_f220:
       value: 1
       latex: \mathrm{c}_{\rm pa4}^{\rm f220}
diff --git a/likelihoods/act_dr6_ttonly.yaml b/likelihoods/act_dr6_ttonly.yaml
index 97e9ec9..697829b 100644
--- a/likelihoods/act_dr6_ttonly.yaml
+++ b/likelihoods/act_dr6_ttonly.yaml
@@ -154,6 +154,10 @@ act_dr6_mflike.ACTDR6MFLike:
       value: 0.0
       latex: \alpha_{\rm tSZ}
 
+    calG_all:
+      value: 1
+      latex: \mathrm{A}_{\rm Planck}
+
     cal_dr6_pa4_f220:
       value: 1
       latex: \mathrm{c}_{\rm pa4}^{\rm f220}
diff --git a/params/foregrounds.yaml b/params/foregrounds.yaml
index f3a358c..c6bb2f5 100644
--- a/params/foregrounds.yaml
+++ b/params/foregrounds.yaml
@@ -124,6 +124,16 @@ xi:
     max: 0.2
   proposal: 0.05
   latex: \xi
+alpha_tSZ:
+  prior:
+    min: -1.5
+    max: 1.5
+  ref:
+    dist: norm
+    loc: 0.0
+    scale: 0.3
+  proposal: 0.1
+  latex: \alpha_\mathrm{tSZ}
 
 # Fixed values of nuisance
 T_d: