diff --git a/.github/workflows/linting.yml b/.github/workflows/linting.yml
index 6098a6e..c253599 100644
--- a/.github/workflows/linting.yml
+++ b/.github/workflows/linting.yml
@@ -23,6 +23,7 @@ jobs:
         sudo apt-get update
         python -m pip install --upgrade pip
         sudo apt install libbz2-dev
+        conda install -c conda-forge somoclu
         pip install wheel
         pip install .
         pip install .[dev]
diff --git a/.github/workflows/testing-and-coverage.yml b/.github/workflows/testing-and-coverage.yml
index 032b2cd..67c09f4 100644
--- a/.github/workflows/testing-and-coverage.yml
+++ b/.github/workflows/testing-and-coverage.yml
@@ -28,6 +28,7 @@ jobs:
         sudo apt-get update
         python -m pip install --upgrade pip
         sudo apt install libbz2-dev
+        conda install -c conda-forge somoclu
         pip install wheel
         pip install .
         pip install .[dev]
diff --git a/src/rail/pipelines/estimation/tomography.py b/src/rail/pipelines/estimation/tomography.py
index 927adf8..f2419fd 100644
--- a/src/rail/pipelines/estimation/tomography.py
+++ b/src/rail/pipelines/estimation/tomography.py
@@ -22,6 +22,7 @@ def __init__(
             classifiers: dict | None=None,
             summarizers: dict | None=None,
             n_tomo_bins: int=5,
+            nsamples: int=20
         ):
         RailPipeline.__init__(self)
 
@@ -53,7 +54,7 @@ def __init__(
                 self.default_input_dict[f"input_{pz_algo_name_}"] = 'dummy.in'
                 self.add_stage(the_classifier)
 
-                for ibin in range(n_tomo_bins):
+                for ibin in range(1, n_tomo_bins+1):
 
                     true_nz = TrueNZHistogrammer.make_and_connect(
                         name=f"true_nz_{pz_algo_name_}_{classifier_name_}_bin{ibin}",
@@ -77,6 +78,6 @@ def __init__(
                                 tomography_bins=the_classifier.io.output,
                             ),
                             selected_bin=ibin,
-                            nsamples=20,
+                            nsamples=nsamples,
                         )
                         self.add_stage(the_summarizer)