Linear polarisation degree and γ-ray flux as a function of time. We show observations taken with the KVN at 22, 43, 86, and 129 GHz, with the IRAM 30 m telescope as part of the POLAMI programme at 86 and 225 GHz, with the SMA at 225 GHz (all in colour and circles) and Fermi-LAT in γ-rays (grey crosses connected by a dashed line). In addition, the black triangles denote the VLBI polarisation degree of the core and C3 at 43 GHz. The filled triangles with an error bar correspond to a detection (close to the γ-ray peak, with the entirety of the flare being denoted with the shaded light pink area), the empty triangle to a non-detection upper limit. All values are listed in Table 1. The well-known trend for 3C 84 of higher polarisation values at higher frequencies is observed here as well. The radio observation dates span from MJD 60696 to 60767. During this time frame, some depolarisation is also observed, possibly because multiple jet components blurred the s.d./c.i measurements.