This is a definition for histogram data from Spallation Neutron Source (SNS) at ORNL. Details of all logs, both from cvinfo file and from HistoTool (frequency and proton_charge). Motor logs from cvinfo file. Command string for event2histo_nxl. Official NXDL schema after this file goes to applications. Detector calibration id from DAS. Six out of nine rotation parameters. Original specification called for NXchopper, which is not a valid NeXus base class. Select either NXdisk_chopper or NXfermi_chopper, as appropriate. Original specification called for NXchopper, which is not a valid NeXus base class. Select either NXdisk_chopper or NXfermi_chopper, as appropriate. Six out of nine rotation parameters. Six out of nine rotation parameters. Descriptive name of sample