def extract_mean_std_curves(dstore, what):
    """
    Yield imls/IMT and poes/IMT containg mean and stddev for all sites
    """
    getter = getters.PmapGetter(dstore)
    arr = getter.get_mean().array
    for imt in getter.imtls:
        yield 'imls/' + imt, getter.imtls[imt]
        yield 'poes/' + imt, arr[:, getter.imtls(imt)]