fid=fopen('abc.txt','r');
abc=textscan(fid,'%s',inf,'Delimiter','\n','HeaderLines',2,'commentstyle','1','texttype','string');
fid=fclose(fid);
abc=string(abc{:});
abc=abc(contains(abc,'Gp#'));
xy=str2double(split(extractBetween(abc,'x,y = ',' dT'),','));
ampl=str2double(extractAfter(abc,'Amplitude = '));
tABC=table(xy(:,1),xy(:,2),ampl,'VariableNames',{'x','y','amplitude'});
results in
>> head(tABC)
ans =
8×3 table
x y amplitude
______ ____ _________
-14.46 0.00 36.00
-14.46 0.00 35.00
13.39 0.00 34.00
-18.75 0.00 32.00
19.82 0.00 36.00
-20.89 0.00 32.00
19.82 0.00 50.00
-5.89 0.00 36.00
>>
