def fake_header(Nc):
    """
    This function creates a fake header
    From the number of columns, the header
    will contain colX, colY...
    Parameters:
    -----------
    Nc      int, number of column in the file

    Return
    ------
    fake_header list, of string with fake header
    """
    fake_header = []
    for i in range(Nc):
        fake_header.append('col%s' % str(i + 1))
    return fake_header
