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tokens: This work has been supported by the Croatian Science Foundation under the project 7549 “Millimeter and submillimeter observations of the solar chromosphere with ALMA” and also supported by NASA Heliophysics LWS grant NNX16AB79G (SHS). Facility: SDO (AIA) . Software: astropy (Astropy Collaboration et al. 2013 , 2018 ), Period04 (Lenz Breger 2005 ), SunPy (SunPy Community et al. 2015 ).