Two-point correlation function (TPCF) as a function of spatial separation scale for the sample galaxies is shown in this figure for young (< 10 Myr), old (> 10 Myr) and all (young + old) SFCs. The mathematical models describing the observed TPCF plots (Section 5) for a given population of SFCs are mentioned in the brackets. The hierarchy parameters such as l_corr and r_c are also marked by dash-dotted blue and green lines. The slope of the TPCF plots for the young and old SFC distributions is quoted in blue and red colour, respectively. The shaded grey region has TPCF < 1 where the distribution of SFCs can be considered as Poissonian. The shaded yellow region represents the edge effect limit beyond which TPCF needs careful interpretation. This limit is equal to 1/5th of the largest separation between any two SFCs in the galaxy. The UVIT resolution limit for the galaxies is 25−130 pc and it is much smaller than the smallest separation seen in the TPCF plots of each galaxy.