The augmented interval (+6) of the chord usually embellishes 5th degree, we could have used symbols like Ger+6/5th, but it is understood that β/5thβ is implied when we write βGer+6β
In Romantic period, the +6 is sometimes applied to scale degrees other than the 5th, and those cases, we make this clear as shown below:
To spell or recognize the various +6 types, you will have to familiar with the intervallic structure of the three kinds of augmented sixth chord