def METHOD_NAME(zmap_data, nan_value):
    """Parse actual values in zmap plus ascii files.
    Note that header's node_width and nr_nodes_per_line in ZMAP header are not applied,
    meaning that values import here is more tolerant than original zmap spec.
    """
    values = []
    for line in zmap_data:
        if is_comment(line):
            continue
        else:
            values += line.split()
    values = np.array(values, dtype=np.float32)
    values = np.ma.masked_equal(values, nan_value)
    return values