I have obtained cube files of charge density difference using Quantum Espresso. I am trying to plot these as a contour plot in an aesthetically pleasing manner with good quality. I'm aware that XCrsyDen could do this, but the resolution of the exported file isn't good. Also tried Vesta, but was not satisfied with the results. I desire to plot something like figure 5 in this paper (https://doi.org/10.1186/s11671-018-2605-3). Is there some other software/piece of code that can help accomplish similar results?
Any help would be appreciated.