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Fig. 2
SED for 4U 1728−34. We fit the broad-band spectrum with power laws of indices α = 0.28 ± 0.05 and α = –0.8 ± 0.7 below and above ~6.5 × 1013 Hz, respectively. The Swift/BAT points correspond to the flux densities derived in Sect. 3.1 for observations before and after the ALMA observations (see Table 1).
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