plot'log_exp_Sparse.txt' index 0 using 1:4 t "No log exp" with linespoints ls 2,\
'log_exp_Sparse.txt' index 0 using 1:2 t "with log exp" with linespoints ls 1,\
plot'log_exp_Sparse.txt' index 0 using 1:4 t "No log exp" with linespoints ls 2,\
'log_exp_Sparse.txt' index 0 using 1:2 t "with log exp" with linespoints ls 1,\