Question about zener diode

[munna007]

Do u agree with the statement given in picture i have attached about zener diode. i have taken this snapshot from a book on electronic devices.

 

[NascentOxygen]

I think that's how it's usually explained. Also, the temperature sensitivity has opposite signs for avalanche cf. zener, and around that 6v region the temperature sensitivity (mV/°C) is a minimum.