I read a table from a txt file as follows. How to delete rows or columns after import it? It seems that no function of org-table-delete-row exits in org.

#+begin_src emacs-lisp
  (org-table-import "ttt.out" nil)
#+end_src

The file ttt.out will be:

#Cluster   Frames   Rep RepScore   Rep RepScore
       0      23      2      0.6     6      0.4 
       1      10      5      0.1     3      0.5
       2       5      4      0.4     5      0.6
       3       4      1      0.4     2      0.6

The results I need (delete third rows and columns of RepScore).

| #Cluster | Frames | Rep | Rep |
|        0 |     23 |   2 |   6 |
|        2 |      5 |   4 |   5 |
|        3 |      4 |   1 |   2 |