a, location of the clumpy galaxy AUDFs01 on the Hα - [O III] plane. The line fluxes are measured from HST grism G141 data20. AUDFs01 being the only galaxy having highest [O III] flux in the XDF region; the color bar indicates the stellar masses of the galaxies. b, c, Mass Excitation and BPT diagram using the SDSS galaxies. d, location of AUDFs01 on the Sobral et al. (2009) plot. The line ratios for all galaxies except AUDFs01 are taken from z-COSMOS survey57 at z ~ 0.84. The error bars represent 1σ uncertainties on the flux measurements.