How to add formatting to a text file made with dlmwrite?

So I have a pretty simple code that takes a text file that looks like the following (let's say the text file is called example.txt:

Time, m
5.1,6
5.3,9
5.5,9
5.7,12
5.9,15

And using a code adjusts the time increment and creates a new text file that looks like this:

examplefinal.txt
0.06
5.100000,6.000000
5.160000,6.900000
5.220000,7.800000
5.28...
...
5.880000,17.700000

My question is with the formatting of the final file, I want to see if there's any way I can add spaces before each line of numbers, as well as a space before and after the comma in between the two columns, so it looks like this:

examplefinal.txt
0.06
  5.100000 , 6.000000
  5.160000 , 6.900000
  5.220000 , 7.800000
  ...
  5.880000 , 17.700000

Here's my code so far:

function [finalfile] = example(ex)

incr = 0.06 %time increment

exid = fopen(ex)
A = textscan(thid, '%f %f', 'delimiter', ',', 'headerlines', 1);
t = A{1};
m = A{2};
FullMat = [t m];

timecol1 = min(FullMat(:,1)) : incr : max(FullMat(:,1))
timecol2 = interp1(FullMat1(:,1), FullMat(:,2:end), timecol1(:))
NewTime = [timecol1(:) timecol2];

finalfile = sprintf('%sfinal.txt', ex(1:end-4));

finalfile = fopen(finalfile,'w');
frpintf(finalfile, '%s\n%f\n', finalfile, incr)

dlmwrite(finalfile,NewTime, '-append', 'delimiter', ',', 'precision', '%.6f')
end

For the delimiter, I can't just change it to ' , ' to fix the spaces in between numbers, I run the error " , is not a valid attribute or delimiter. Delimiter must be a single character."

Any help anyone can provide would be very appreciated, thanks!