diff --git a/src/theoretical/transiogram/exponential.jl b/src/theoretical/transiogram/exponential.jl
index f454781..c629bbb 100644
--- a/src/theoretical/transiogram/exponential.jl
+++ b/src/theoretical/transiogram/exponential.jl
@@ -28,5 +28,6 @@ function (t::ExponentialTransiogram)(h)
   h′, r′ = unitless(h, r)
   v = 1 - exp(-3(h′ / r′))
   T = typeof(p[1] * v)
-  SMatrix{L,L}(i == j ? T(1 - (1 - p[j]) * v) : T((p[j] * v)) for i in 1:L, j in 1:L)
+  ϵ = T(1e-6) # add small eps for numerical stability
+  SMatrix{L,L}(i == j ? T(1 - (1 - p[j]) * v) - ϵ * (L - 1) : T(p[j] * v) + ϵ for i in 1:L, j in 1:L)
 end
diff --git a/src/theoretical/transiogram/gaussian.jl b/src/theoretical/transiogram/gaussian.jl
index 0028a7a..77b8c1c 100644
--- a/src/theoretical/transiogram/gaussian.jl
+++ b/src/theoretical/transiogram/gaussian.jl
@@ -28,5 +28,6 @@ function (t::GaussianTransiogram)(h)
   h′, r′ = unitless(h, r)
   v = 1 - exp(-3(h′ / r′)^2)
   T = typeof(p[1] * v)
-  SMatrix{L,L}(i == j ? T(1 - (1 - p[j]) * v) : T((p[j] * v)) for i in 1:L, j in 1:L)
+  ϵ = T(1e-6) # add small eps for numerical stability
+  SMatrix{L,L}(i == j ? T(1 - (1 - p[j]) * v) - ϵ * (L - 1) : T(p[j] * v) + ϵ for i in 1:L, j in 1:L)
 end
diff --git a/src/theoretical/transiogram/linear.jl b/src/theoretical/transiogram/linear.jl
index 69abcab..5821e41 100644
--- a/src/theoretical/transiogram/linear.jl
+++ b/src/theoretical/transiogram/linear.jl
@@ -26,8 +26,11 @@ function (t::LinearTransiogram)(h)
   p = t.prop
   L = length(p)
   h′, r′ = unitless(h, r)
+  v = h′ / r′
+  T = typeof(p[1] * v)
+  ϵ = T(1e-6) # add small eps for numerical stability
   SMatrix{L,L}(
-    i == j ? (h′ < r′) * (1 - (1 - p[j]) * (h′ / r′)) + (h′ ≥ r′) * p[j] :
-    (h′ < r′) * (p[j] * (h′ / r′)) + (h′ ≥ r′) * p[j] for i in 1:L, j in 1:L
+    i == j ? (h′ < r′) * T(1 - (1 - p[j]) * v) + (h′ ≥ r′) * T(p[j]) - ϵ * (L - 1) :
+    (h′ < r′) * T(p[j] * v) + (h′ ≥ r′) * T(p[j]) + ϵ for i in 1:L, j in 1:L
   )
 end
diff --git a/src/theoretical/transiogram/spherical.jl b/src/theoretical/transiogram/spherical.jl
index 1292974..2e8f087 100644
--- a/src/theoretical/transiogram/spherical.jl
+++ b/src/theoretical/transiogram/spherical.jl
@@ -28,8 +28,9 @@ function (t::SphericalTransiogram)(h)
   h′, r′ = unitless(h, r)
   v = 3(h′ / r′) / 2 - (h′ / r′)^3 / 2
   T = typeof(p[1] * v)
+  ϵ = T(1e-6) # add small eps for numerical stability
   SMatrix{L,L}(
-    i == j ? (h′ < r′) * T(1 - (1 - p[j]) * v) + (h′ ≥ r′) * T(p[j]) : (h′ < r′) * T((p[j] * v)) + (h′ ≥ r′) * T(p[j])
-    for i in 1:L, j in 1:L
+    i == j ? (h′ < r′) * T(1 - (1 - p[j]) * v) + (h′ ≥ r′) * T(p[j]) - ϵ * (L - 1) :
+    (h′ < r′) * T(p[j] * v) + (h′ ≥ r′) * T(p[j]) + ϵ for i in 1:L, j in 1:L
   )
 end