const image/jpeg.maxTq

4 uses

	image/jpeg (current package)
		reader.go#L45: 	maxTq   = 3
		reader.go#L149: 	quant      [maxTq + 1]block // Quantization tables, in zig-zag order.
		reader.go#L345: 		if d.comp[i].tq > maxTq {
		reader.go#L440: 		if tq > maxTq {