diff --git a/apps/graph/values/values_controller.cpp b/apps/graph/values/values_controller.cpp
index 5df51b57c..7730a4916 100644
--- a/apps/graph/values/values_controller.cpp
+++ b/apps/graph/values/values_controller.cpp
@@ -23,8 +23,7 @@ ValuesController::ValuesController(Responder * parentResponder, InputEventHandle
 }
 
 bool ValuesController::handleEvent(Ion::Events::Event event) {
-  if ((event == Ion::Events::OK || event == Ion::Events::EXE) && selectedRow() == 0
-      && selectedColumn()>0 && isDerivativeColumn(selectedColumn())) {
+  if ((event == Ion::Events::OK || event == Ion::Events::EXE) && typeAtLocation(selectedColumn(), selectedRow()) == 1 && isDerivativeColumn(selectedColumn())) {
     configureDerivativeFunction();
     return true;
   }
@@ -34,13 +33,13 @@ bool ValuesController::handleEvent(Ion::Events::Event event) {
 void ValuesController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
   Shared::ValuesController::willDisplayCellAtLocation(cell, i, j);
   // The cell is the abscissa title cell:
-  if (j == 0 && i == 0) {
+  if (typeAtLocation(i,j) == 0) {
     EvenOddMessageTextCell * mytitleCell = (EvenOddMessageTextCell *)cell;
     mytitleCell->setMessage(I18n::Message::X);
     return;
   }
   // The cell is a function title cell:
-  if (j == 0 && i > 0) {
+  if (typeAtLocation(i,j) == 1) {
     Shared::BufferFunctionTitleCell * myFunctionCell = (Shared::BufferFunctionTitleCell *)cell;
     const size_t bufferNameSize = Shared::Function::k_maxNameWithArgumentSize + 1;
     char bufferName[bufferNameSize];
@@ -70,7 +69,7 @@ IntervalParameterController * ValuesController::intervalParameterController() {
 }
 
 Ion::Storage::Record ValuesController::recordAtColumn(int i) {
-  assert(i > 0);
+  assert(typeAtLocation(i, 0) == 1);
   int index = 1;
   for (int k = 0; k < functionStore()->numberOfDefinedModels(); k++) {
     Ion::Storage::Record record = functionStore()->definedRecordAtIndex(k);
@@ -93,7 +92,7 @@ Ion::Storage::Record ValuesController::recordAtColumn(int i) {
 }
 
 bool ValuesController::isDerivativeColumn(int i) {
-  assert(i >= 1);
+  assert(typeAtLocation(i, 0) == 1);
   int index = 1;
   for (int k = 0; k < functionStore()->numberOfDefinedModels(); k++) {
     ExpiringPointer<CartesianFunction> f = functionStore()->modelForRecord(functionStore()->definedRecordAtIndex(k));
diff --git a/apps/regression/store_controller.cpp b/apps/regression/store_controller.cpp
index 5d237dee0..786b79bd7 100644
--- a/apps/regression/store_controller.cpp
+++ b/apps/regression/store_controller.cpp
@@ -36,7 +36,7 @@ bool StoreController::fillColumnWithFormula(Expression formula) {
 
 void StoreController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
   ::StoreController::willDisplayCellAtLocation(cell, i, j);
-  if (cellAtLocationIsEditable(i, j)) {
+  if (typeAtLocation(i, j) != k_titleCellType) {
     return;
   }
   Shared::StoreTitleCell * mytitleCell = static_cast<Shared::StoreTitleCell *>(cell);
diff --git a/apps/sequence/values/values_controller.cpp b/apps/sequence/values/values_controller.cpp
index 5bb6a3880..6fee9bd80 100644
--- a/apps/sequence/values/values_controller.cpp
+++ b/apps/sequence/values/values_controller.cpp
@@ -23,13 +23,13 @@ ValuesController::ValuesController(Responder * parentResponder,InputEventHandler
 void ValuesController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
   Shared::ValuesController::willDisplayCellAtLocation(cell, i, j);
   // The cell is the abscissa title cell:
-  if (j == 0 && i == 0) {
+  if (typeAtLocation(i,j) == 0) {
     EvenOddMessageTextCell * mytitleCell = (EvenOddMessageTextCell *)cell;
     mytitleCell->setMessage(I18n::Message::N);
     return;
   }
   // The cell is a function title cell:
-  if (j == 0 && i > 0) {
+  if (typeAtLocation(i,j) == 1) {
     SequenceTitleCell * myCell = (SequenceTitleCell *)cell;
     Sequence * sequence = functionStore()->modelForRecord(recordAtColumn(i));
     myCell->setLayout(sequence->nameLayout());
diff --git a/apps/shared/store_controller.cpp b/apps/shared/store_controller.cpp
index 4a9143535..3a99ec424 100644
--- a/apps/shared/store_controller.cpp
+++ b/apps/shared/store_controller.cpp
@@ -153,7 +153,7 @@ int StoreController::typeAtLocation(int i, int j) {
 
 void StoreController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
   // Handle the separator
-  if (cellAtLocationIsEditable(i, j)) {
+  if (typeAtLocation(i, j) == k_editableCellType) {
     bool shouldHaveLeftSeparator = i % DoublePairStore::k_numberOfColumnsPerSeries == 0;
     static_cast<StoreCell *>(cell)->setSeparatorLeft(shouldHaveLeftSeparator);
   }
@@ -170,7 +170,7 @@ void StoreController::willDisplayCellAtLocation(HighlightCell * cell, int i, int
     }
     return;
   }
-  if (cellAtLocationIsEditable(i, j)) {
+  if (typeAtLocation(i, j) == k_editableCellType) {
     static_cast<StoreCell *>(cell)->setHide(false);
   }
   willDisplayCellAtLocationWithDisplayMode(cell, i, j, Preferences::PrintFloatMode::Decimal);
@@ -220,10 +220,7 @@ Responder * StoreController::tabController() const {
 }
 
 bool StoreController::cellAtLocationIsEditable(int columnIndex, int rowIndex) {
-  if (rowIndex > 0) {
-    return true;
-  }
-  return false;
+  return typeAtLocation(columnIndex, rowIndex) == k_editableCellType;
 }
 
 bool StoreController::setDataAtLocation(double floatBody, int columnIndex, int rowIndex) {
diff --git a/apps/shared/store_controller.h b/apps/shared/store_controller.h
index 11fd68a0f..d5c0de1df 100644
--- a/apps/shared/store_controller.h
+++ b/apps/shared/store_controller.h
@@ -75,7 +75,6 @@ protected:
   };
 
   Responder * tabController() const override;
-  bool cellAtLocationIsEditable(int columnIndex, int rowIndex) override;
   bool setDataAtLocation(double floatBody, int columnIndex, int rowIndex) override;
   double dataAtLocation(int columnIndex, int rowIndex) override;
   virtual HighlightCell * titleCells(int index) = 0;
@@ -88,6 +87,7 @@ private:
   SelectableTableView * selectableTableView() override {
     return m_contentView.dataView();
   }
+  bool cellAtLocationIsEditable(int columnIndex, int rowIndex) override;
   int numberOfElementsInColumn(int columnIndex) override;
   int maxNumberOfElements() const override {
     return DoublePairStore::k_maxNumberOfPairs;
diff --git a/apps/shared/values_controller.cpp b/apps/shared/values_controller.cpp
index 0aec8826a..53779c755 100644
--- a/apps/shared/values_controller.cpp
+++ b/apps/shared/values_controller.cpp
@@ -104,7 +104,7 @@ bool ValuesController::handleEvent(Ion::Events::Event event) {
     return header()->handleEvent(event);
   }
   if ((event == Ion::Events::OK || event == Ion::Events::EXE) && selectedRow() == 0) {
-    if (selectedColumn() == 0) {
+    if (typeAtLocation(selectedColumn(), 0) == 0) {
       configureAbscissa();
       return true;
     }
@@ -146,7 +146,7 @@ Button * ValuesController::buttonAtIndex(int index, ButtonRowController::Positio
 void ValuesController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
   willDisplayCellAtLocationWithDisplayMode(cell, i, j, Preferences::sharedPreferences()->displayMode());
   // The cell is not a title cell and not editable
-  if (j > 0 && i > 0) {
+  if (typeAtLocation(i,j) == 3) {
     constexpr int precision = Preferences::LargeNumberOfSignificantDigits;
     char buffer[PrintFloat::bufferSizeForFloatsWithPrecision(precision)];
     // Special case: last row
@@ -254,7 +254,7 @@ void ValuesController::viewDidDisappear() {
 }
 
 Ion::Storage::Record ValuesController::recordAtColumn(int i) {
-  assert(i > 0);
+  assert(typeAtLocation(i, 0) == 1);
   return functionStore()->activeRecordAtIndex(i-1);
 }
 
@@ -286,10 +286,7 @@ void ValuesController::configureFunction() {
 }
 
 bool ValuesController::cellAtLocationIsEditable(int columnIndex, int rowIndex) {
-  if (rowIndex > 0 && columnIndex == 0) {
-    return true;
-  }
-  return false;
+  return typeAtLocation(columnIndex, rowIndex) == 2;
 }
 
 bool ValuesController::setDataAtLocation(double floatBody, int columnIndex, int rowIndex) {
diff --git a/apps/statistics/store_controller.cpp b/apps/statistics/store_controller.cpp
index 9dac9c3fe..5a4c93237 100644
--- a/apps/statistics/store_controller.cpp
+++ b/apps/statistics/store_controller.cpp
@@ -39,7 +39,7 @@ bool StoreController::fillColumnWithFormula(Expression formula) {
 
 void StoreController::willDisplayCellAtLocation(HighlightCell * cell, int i, int j) {
   Shared::StoreController::willDisplayCellAtLocation(cell, i, j);
-  if (cellAtLocationIsEditable(i, j)) {
+  if (typeAtLocation(i, j) != k_titleCellType) {
     return;
   }
   Shared::StoreTitleCell * mytitleCell = static_cast<Shared::StoreTitleCell *>(cell);