Photometry of HH 30. The plots show (a) the total magnitude ﹩m_{\mathrm{total}\,}﹩, (b) the difference between the magnitudes of the upper and lower nebula ﹩m_{u}-m_{l}﹩, (c) the difference between the left and right sides of the upper nebula ﹩m_{ul}-m_{ur}﹩, and (d) the difference between the left and right sides of the lower nebula ﹩m_{ll}-m_{lr}﹩. The symbols denote the filter: F439W (diamonds), F555W or F547M (plus signs), F606W, F675W, or F625W (asterisks), F814W (circles), F110W (crosses), F160W (squares), and F204M (triangles).