def getChrLenList(chrLenDict, c):
    """ Given a chromosome length dictionary keyed on chromosome names and 
    a chromosome name (c) this returns a list of all the runtimes for a given
    chromosome across all Step names.
    """
    l = []
    if c not in chrLenDict:
        return l
    for n in chrLenDict[c]:
        l.append(chrLenDict[c][n])
    return l