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   PR # 11061
    We propose here to observe plerion type SNRs.  They are center filled
    structure emission is from thin thermal in origin.  They are near the
    galactic plane where tnt role.  Using SIS on board ASCA, we can
    separate K emission of He like ion from them depends on the ion
    temperature.  Furthermore, it also depends on the NH, pare can
    determine the NH from the intensity ratio between them for various
    elements uncertanity in the element abundance.





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