def FindShortSourceChannels(these_source_nodes,threshold_length):
    """This function gets the list of sources that are shorter than a threshold value

    Args:
        these_source_nodes (dict): A dict from the FindSourceInformation module
        threshold_length (float): The threshold of chi lenght of the source segment

    Return:
        long_sources: A list of integers of source with the appropriate length

    Author: SMM
    """
    long_sources = []
    for key in these_source_nodes:
        if these_source_nodes[key]["SourceLength"] > threshold_length:
            long_sources.append(key)

    return long_sources