Comparison of deep amateur images from the STSS with data obtained with large professional telescopes (top) and large-scale CCD imaging surveys (bottom). From left to right, the (top panels) show NGC 4216 taken with the Canada-French-Hawaii 3.6-m telescope (Paudel et al. 2013), NGC 2275 from stacked images from SDSS (see Morales et al. 2018), NGC 3631 with the CTIO Blanco 4-m telescope (Martínez-Delgado et al. 2023a), and a stellar density map from the resolved red giant branch stars of the stellar halo of NGC 4631 taken with the Subaru 8.2-m telescope (Tanaka et al. 2017). From left to right, the (bottom panels) show NGC 4216 taken with the BBO 0.5-m telescope (Martínez-Delgado et al. 2010), NGC 2275 (this work; see Table 2), NGC 3631 (this work; see Table 2), and NGC 4631 obtained with the ROSA 0.3-m telescope Martínez-Delgado et al. 2015).