M 33 galaxy surface brightness profile in K band with components decomposition. Dots represent observational data. Solid black line shows profile composed of two components: exponential disc (blue dashed) and spheroidal component (red dash-dotted).
<a href="//commons.wikimedia.org/wiki/User:Vallastro" title="User:Vallastro">Vallastro</a>
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<span class="int-own-work" lang="en">Own work</span>