def read_gems(directory, file_name):
    """
    Read a GEM file of the form "PlinePgem".
    Args:
       directory (str): directory of the file location (ex: '/Users/kimm/')
       file_name (str): name of the file (ex: 'SHG0008H.Fragnum_PlinePgem')
    Returns:
       in_gems (list): tab-separated lists of lists
    """
    with open(directory + file_name) as f:
        in_gems = [line.strip().split("\t") for line in f]
    return in_gems