# What does a dashed resistor symbol mean?

What is the dashed resistor symbol going to the ground shown in the picture?

Thank you.

• Have you read the accompanying text? – Ignacio Vazquez-Abrams Oct 21 '16 at 15:08
• There's a nice * there and a nice note right there on your picture that tells you exactly what it means. There must be a galvanic path from Vin- to ground. That resistor represents that path. – jonk Oct 21 '16 at 15:08
• A dashed symbol or wire normally means that the part is not always present in the circuit or that it can be left out under certain circumstances. In this case it's meaning seems to be that the resistor can be left out if V_IN- already has some specific properties. – Martin Rosenau Oct 21 '16 at 15:42
• Vref needs an input bias path to ground proabably, which may or may not be provided whatever you put on Vin- – Voltage Spike Oct 21 '16 at 16:20