read data

Dear all:

I need to read a data file in text type. However, the data is interspersed
with headings in the following format:

header1  header2 header3
1              2            3
4              5            6
....
(space)
 header1  header2 header3
(space)
11                 22          33
44                 55          66
...
 (space)
 header1  header2 header3
(space)
111             222          333
444             555          666
...

Is there any way to read the data without importing the headers? Any
suggestion is highly appreciated.
Thanks for help.