l–ν diagram of the low-frequency, low-degree (1 ⩽ l ⩽ 3) modes measured with the integrated-light instruments GOLF and BiSON (open circles) by R. A. García, P. Boumier, and W. J. Chaplin (2007, private communications) and with the spatially resolved instruments GONG and MDI using the m-averaged spectrum technique (red dots), over comparable periods of time.