Fig. 7
Integrated 21-cm optical depth vs. impact parameter for QGPs with 21-cm absorption measurements. The QGPs from Table 3 are plotted as stars. Also plotted as diamonds and squares are 3σ upper limits corresponding to a velocity resolution of 10 km s-1 from Tables 2 and 5 of Gupta et al. (2010) and Table 3 of Borthakur et al. (2011), respectively.
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