The following code will read the data as you require:
% Setup the Import Options
opts = delimitedTextImportOptions("NumVariables", 2);
opts.DataLines = [2, Inf];
opts.Delimiter = ["\t", " "];
opts.VariableNames = ["title", "MachNumber"];
opts.VariableTypes = ["double", "double"];
opts.ExtraColumnsRule = "ignore";
opts.EmptyLineRule = "read";
opts.ConsecutiveDelimitersRule = "join";
% avoid rows with text settings
opts.ImportErrorRule = "omitrow";
opts.MissingRule = "omitrow";
% Import the data
requiredTable = readtable("CASE1_MACH.txt", opts);
Hope this helps!
