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fi='LICOR.TXT';

fid=fopen(fi);

dat1=textscan(fid,'%f%s%f','delimiter','\t');

val1=dat1(3);
val2=val1{:};

date1=dat1(2);
date2=char(date1{:});
date3=datenum(date2);

fclose(fid);

figure(1)
plot(date3,val2)
datetick('x','hh:MM:SS')