Altherma 3 MT W Indoor unit sensors from piping diagram

[MichaelST01]

Based on the piping diagram (indoor unit: ETBH12EF6V+9W)
I found the following sensors in main/include/def/ALTHERMA(TOP-GRADE).h:

R1T water IN - {0x61,2,105,2,1,"Leaving water temp. before BUH (R1T)"}
R2T backup heater – water OUT - {0x61,4,105,2,1,"Leaving water temp. after BUH (R2T)"}

additional from the wiring diagram:
R5T Domestic hot water thermistor - {0x61,10,105,2,1,"DHW tank temp. (R5T)"}
R6T External indoor or outdoor ambient thermistor - {0x61,14,105,2,1,"Ext. indoor ambient sensor (R6T)"}