diff --git a/utils/outerjoinRowToTable.m b/utils/outerjoinRowToTable.m
index 1d37b4c..74d9e8a 100644
--- a/utils/outerjoinRowToTable.m
+++ b/utils/outerjoinRowToTable.m
@@ -5,8 +5,9 @@ function Table = outerjoinRowToTable(Table,TableRowToBeAdded)
 %doubles.
 %
 % * Strings in the table are not yet supported.
-% * The row that is added needs to be formated as table
-% * Adds only one row at a time. Update 2024: Adds several rows, that is tables
+% * The row that is added needs to be formatted as table
+% * Update 2024: Adds several rows, that is tables
+% * Update 2026: Handles peakfitting columns with different size.
 %
 %   T = outerjoinRowToTable(TableToAddTo,RowToBeAdded) 
 %
@@ -50,6 +51,35 @@ if ~all(ismember(TableRowToBeAdded.Properties.VariableNames,Table.Properties.Var
         end
     end
 end
+% Reconcile column widths for peak-fit columns.
+% These numeric columns can have variable width (one entry per peak),
+% so a width mismatch is expected when spectra have different numbers
+% of peaks. Pad the narrower side with NaN.
+variableWidthColumns = {'peakArea', 'peakPosition', 'peakFWHM', ...
+                        'peakBackground', 'peakEta', 'peakShirleyK'};
+
+for ii = 1:numel(variableWidthColumns)
+    varName = variableWidthColumns{ii};
+
+    if ~ismember(varName, Table.Properties.VariableNames) || ...
+       ~ismember(varName, TableRowToBeAdded.Properties.VariableNames)
+        continue
+    end
+
+    widthT = size(Table.(varName), 2);
+    widthR = size(TableRowToBeAdded.(varName), 2);
+
+    if widthT < widthR
+        Table.(varName) = [Table.(varName), ...
+            NaN(height(Table), widthR - widthT)];
+    elseif widthR < widthT
+        TableRowToBeAdded.(varName) = [TableRowToBeAdded.(varName), ...
+            NaN(height(TableRowToBeAdded), widthT - widthR)];
+    end
+end
+
+% Ensure matching column order before concatenation
+TableRowToBeAdded = TableRowToBeAdded(:, Table.Properties.VariableNames);
 % Add row to table
 Table = [Table;TableRowToBeAdded];
 end
\ No newline at end of file