<cell xmlns="http://www.tei-c.org/ns/1.0" rows="3"><foreign xml:lang="fra">plan <choice> <abbr>perp.</abbr> <expan>perpendiculaire</expan> </choice> au <choice> <abbr>mérid.</abbr> <expan>méridien</expan> </choice> <choice> <abbr>magn.</abbr> <expan resp="#CT">magnétique</expan> </choice> 30 <choice> <abbr>osc.</abbr> <expan>oscillations</expan> </choice></foreign> —</cell> <cell xmlns="http://www.tei-c.org/ns/1.0">48.2</cell>