Invalid Data Arguement when plotting

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Using a imported xlsx file with data, been trying to plot 2 different coloumns on 1 graph as shown below. However, I am getting 'error using plot. Invalid data arguement'. Both columns have the same amount of cells.

opts = spreadsheetImportOptions("NumVariables", 6);
% Specify sheet and range
opts.Sheet = "level 1";
opts.DataRange = "A2:F5121";
% Specify column names and types
opts.VariableNames = ["X_Value", "Real", "Imaginary", "Magnitude", "Phase", "Coherence"];
opts.VariableTypes = ["double", "double", "double", "double", "double", "double"];
% Import the data
lab2data = readtable('data29.xlsx');
% Plot Magnitude vs Frequency
M1 = lab2data.Magnitude(1:end);
F1 = lab2data.X_Value(1:end);
figure(1)
hold on
plot(F1, M1)
hold off