Distributed amplifier : What is the purpose extra line at the drain

Hi I was reading Broadband RF and Microwave amplifiers by Andrei Grebennikov, Narendra Kumar, Binboga S. Yarman and came across this figure.

I know that the highlighted TL in blue is used to absorb the output capacitance of the gain stage but what is the purpose of another TL that is marked in red?. Could someone please elaborate. Thanks

No.

For adjusting the output capacitance of the gain stage.

I think it is used for matching. Look at 210,211 in US8618883B2 patent (https://patents.google.com/patent/US8618883)