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for k=4:6:length(M),
     Z = M{k,1}
end
 

Z = M(4:6:end)

 fid = fopen('PS_TS30_ref.txt');
C = textscan(fid, '%s')            % makes array from textfile

M = C{1,1}                         % C{1,1} contains all values in rows  
 
for k=4:6:length(M),               % from 4th row on every 6 rows untill length of M
     Z{k,1} = M{k,1}               % write only those rows in a new array Z, other cells are empty []
end

ZelleClean = Z(~cellfun('isempty', Z'));  % delete empty cells from the array Z
 

fid = fopen('PS_TS30_ref.txt');
C = textscan(fid, '%s');            % makes array from textfile
M = C{1,1};                           % C{1,1} contains all values in rows  
Z = M(4:6:length(M));
 

[dummy, Z2] = strtok(Z, ':');