The red points are averaged in the frequency range from 2.5 to 3.7 mHz, while the blue points are averaged in the higher range from 3.7 to 4.4 mHz. The IRIS data bank confirms the well known behaviour of the p-mode linewidths increasing with frequency with a plateau in the middle, that becomes a slight dip in the time of small activity. They both show very clearly the same strong correlation with the sunspot number. The IRIS network has now accumulated a complete solar cycle of full disk data, since the first measurements of sufficient quality are dated July 1 st , 1989. The effects of this gap filling method on the details of the line profiles are being studied.
More efforts remain to be done on the questions of amplitudes and linewidths.
We intend to explore with a special care the highest frequency range, beyond 4.5 mHz and even beyond the cutoff frequency, in the pseudo mode range, where the frequency shifts with activity are unknown so far.