Scaling relations for the ten new confirmed clusters (red symbols). Black points show clusters in the Planck-ESZ sample with XMM-Newton archival data as presented in Planck Collaboration (2011e); green points represent previously-confirmed Planck clusters presented in Planck Collaboration (2011c). The blue lines denote the Y₅₀₀ scaling relations predicted from the REXCESS X-ray observations (Arnaud et al. 2010). Left: relation between apparent SZ signal (Y₅₀₀) and the corresponding normalised Y_X parameter. The grey area corresponds to weighted average Y₅₀₀ values in Y_X bins with ±1σ errors. Right: relation between X-ray luminosity and Y₅₀₀. For most data points, uncertainties on the luminosity are smaller than the point size.