Broadband SED of BL Lac for BB8. Black points and arrows indicate flux points and upper limits obtained from the different instruments. The solid black line shows the fitted co-spatial two-zone SSC model. The dotted and dash-dotted blue lines show the synchrotron and SSC emission of the core, respectively. The dotted and dash-dotted orange lines show the synchrotron and SSC emission of the blob. The dash-dotted and dashed magenta lines show the EC emission from the core and the blob, respectively. The dashed dark red line shows the emission resulting from the interaction between the core and the blob. The solid grey line shows the SED of the previous block. Historical data retrieved from the SSDC database (https://tools.ssdc.asi.it/SED/) are shown with grey open points.