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For both above papers, there were mistakes in calculation of the spectral index errors in Tables 3 which have been corrected in the following replacement tables respectively. Therefore the integrated flux density based spectral index error cited in the text changes to $0.34\pm0.25$ (not $0.34\pm0.15$) for HB3, $0.25\pm0.08$ (not $0.25\pm0.03$) for OA184 and $0.36\pm0.10$ (not $0.36\pm0.06$) for VRO42.05.01. The correct beamwidth for the 2695 MHz effelsberg 100-m in Table 4 (for the both papers) and 5 (only for the second paper) is $4.3 \times 4.3$ arcmin not $3.4 \times 3.4$ arcmin. None of the above corrections affect our discussions and conclusions in the two papers.

(1) Radio spectral index variations of the SNR HB3 (2) Radio spectral index study of the SNRs OA184 and VRO42.05.01