Distribution of parameters of 19 confirmed SMC SNRs using kernel smoothing. The colour of symbols indicate progenitor type for a particular SNR. Data points that fall in the same bin on the x-axis are plotted within a vertical column with equidistant spacing. The upper and lower grey curves delineate the 95% uncertainty level. The corresponding kernel bandwidth h and distribution parameters are shown on each panel. Top left: average diameter distribution. Top right: distribution of ovality, which is defined as 2 (Dmaj − Dmin)∕(Dmaj + Dmin), where Dmaj and Dmin are the major and minor axes, respectively. Bottom left: radio spectral index distribution. Bottom right: estimate of the 1 GHz flux density distribution for the 18 SNRs with available 1 GHz flux density estimates from Table A.1.
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