ADuCM360 ADC input voltage range by reference

HI,

ADuCM360 can select internal reference (1.2V) or external reference (~AVDD).

When I select internal reference, ADC input voltage ranges are ±VREF@G=1, ±500mV@G=2, ±250mV@G=4, ...

and external reference, ranges are ±VREF@G=1, ±500mV@G=2, ±250mV@G=4, ...

Q1, Is VREF effective only at the time of G=1?

Q2, Is an input voltage range decided regardless of an internal/external reference at G>=2?

regards,

HM