diff --git a/ledsa/analysis/ExperimentData.py b/ledsa/analysis/ExperimentData.py
index e347356..3c3f62b 100644
--- a/ledsa/analysis/ExperimentData.py
+++ b/ledsa/analysis/ExperimentData.py
@@ -68,10 +68,13 @@ def load_config_parameters(self) -> None:
         num_layers = int(config_analysis['model_parameters']['num_layers'])
         self.channels = config_analysis.get_list_of_values('DEFAULT', 'camera_channels')
         self.num_ref_images = int(config_analysis['DEFAULT']['num_ref_images'])
-        self.weighting_preference = float(config_analysis['DEFAULT']['weighting_preference'])
-        self.weighting_curvature = float(config_analysis['DEFAULT']['weighting_curvature'])
-        self.lambda_reg = float(config_analysis['DEFAULT']['lambda_reg'])
-        self.num_iterations = int(config_analysis['DEFAULT']['num_iterations'])
+        self.solver = config_analysis['DEFAULT']['solver']
+        if self.solver == 'nonlinear':
+            self.weighting_preference = float(config_analysis['DEFAULT']['weighting_preference'])
+            self.weighting_curvature = float(config_analysis['DEFAULT']['weighting_curvature'])
+            self.num_iterations = int(config_analysis['DEFAULT']['num_iterations'])
+        elif self.solver == 'linear':
+            self.lambda_reg = float(config_analysis['DEFAULT']['lambda_reg'])
         self.reference_property = config_analysis['DEFAULT']['reference_property']
         self.solver = config_analysis['DEFAULT']['solver']
 
diff --git a/ledsa/ledpositions/coordinates.py b/ledsa/ledpositions/coordinates.py
index 85ba67e..db7eafe 100644
--- a/ledsa/ledpositions/coordinates.py
+++ b/ledsa/ledpositions/coordinates.py
@@ -37,8 +37,8 @@ def conversion_matrix(self, led2) -> np.ndarray:
         :return: The conversion matrix between the two LEDs.
         :rtype: np.ndarray
         """
-        a = np.atleast_2d(np.array([self.pix_pos, led2.pix_pos]))
-        b = np.atleast_2d(np.array([self.pos, led2.pos]))
+        a = np.array([self.pix_pos, led2.pix_pos]).reshape(2, 2)
+        b = np.array([self.pos, led2.pos]).reshape(2, 3)
         x = linalg.solve(a, b, assume_a='gen')
         return np.transpose(x)
 
diff --git a/pyproject.toml b/pyproject.toml
index 8ace0f6..92d6851 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,8 +23,7 @@ dependencies = [
     "pandas >= 2.1.2",
     "scipy >= 1.12.0",
     "tables >= 3.9.2",
-    "newrawpy >= 0.18.1; platform_machine == 'arm64'",
-    "rawpy >= 0.18.1; platform_machine != 'arm64'",
+    "rawpy >= 0.19.1",
     "tqdm >=4.66.2",
     "exiv2 >= 0.18.0",
     "piexif >= 1.1.3",