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Summary of features<br />
•Middle-aged <strong>SNR</strong>s<br />
•MCs associated with.<br />
•Extended X-ray sources at the center of HESS<br />
sources.<br />
•Extremely high absorption column density for the<br />
X-rays sources.<br />
•High value of the ratio of TeV to X-ray flux<br />
F T /F X >10<br />
•Spectral break in GeV <strong>and</strong> GeV-TeV b<strong>and</strong>.<br />
•Soft spectral index in TeV: 2.5-2.7.
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