def METHOD_NAME(file, x_size, keywords, update_steps):
    num_keys = len(keywords)
    def content_generator():
        for x in range(x_size):
            yield "SEQHDR  ", array([0], dtype=numpy.int32)
            for m in range(update_steps):
                step = x * update_steps + m
                day = float(step + 1)
                values = [5.0] * num_keys
                yield "MINISTEP", array([step], dtype=numpy.int32)
                yield "PARAMS  ", array([day] + values, dtype=numpy.float32)
    eclio.write(file, content_generator())