What CTV margins do you use for indolent advanced stage lymphoma treated with palliative radiation alone?

If palliation for advanced indolent lymphoma, I use 2 Gy x 2 to gross disease with CTV of 0-1 cm. My goal is to palliate the clinically symptomatic disease and nothing more. Dose has virtually no side effects for most sites, and retreatment is possible in adjacent or same sites if needed.