Radio SED of J1702+1301, including data from our VLBA observation (red squares) as well as archive data from the GMRT, ASKAP, and VLASS surveys (blue labels). The best-fit results of VLBA observations are shown as the red line, with a spectral index of α = −0.21 ± 0.001. This spectrum is only slightly steeper than that found from previous results (black line) fitted from the synthesis imaging with much lower resolutions (An et al. 2023).