(a) H-R diagram showing the survey targets observed with GMRT. (b) Plot of R_K/R_A vs. T_eff, divided into two sections: above the horizontal dashed line showing stars with dynamic magnetospheres (R_A < R_K), and the bottom part showing stars with a CM (R_A > R_K). For both panels, red filled squares and blue filled circles represent stars detected with GMRT under projects 27_048 and 28_075, respectively. Gray symbols represent the additional 16 targets observed with GMRT (from P. Chandra et al. 2015) or uGMRT (from B. Das et al. 2022b). Open symbols represent the undetected targets. The sole detected O star near the upper left corner is HD 37742.