read_data_test.dat

! Two columns of data
! in each line below
# and two different comment characters
1.0	1.0

2.0		2.0
3.0	3.0
		4.0			4.0
5.0	5.0
# nanananana
6.0	6.0 	10.0
7.0	7.0
# nope
8.0 8.0
9.0	9.0
10.	10.0