void getThreshold(char* filename="data/CrabNebula_dnsb_09_loop.root")
{
    //
    // This macro fill the container MHMcEnergies using the task
    // MMcThresholdCalc and shows the results.
    //
    MParList  parlist;

    MTaskList tasklist;
    parlist.AddToList(&tasklist);

    //
    // Setup the parameter list
    // - You need create the container MHMcEnergies.
    //    + You need to put the number of trigger conditions when
    //      you declarete the MHMcEnergies
    //    + If you don't put any dimension to MHMcEnergies it works
    //      taking only the trigger information from MMcTrig
    //
    const UInt_t numtriggerconditions = 4;

    //
    // Create numtriggerconditions histograms of type MHMcEnergy
    // and store the histograms in an TObjArray
    //
    TObjArray *hists = new TObjArray(MParList::CreateObjList("MHMcEnergy", numtriggerconditions));

    //
    // Check if the list really contains the right number of histograms
    //
    if (hists->GetEntriesFast() != numtriggerconditions)
        return;

    //
    // Add the histograms to the paramater list.
    //
    parlist.AddToList(hists);

    //
    // Setup the task list
    // - You need the read and the MMcThresholdCalc tasks
    // - You have to fill the histograms for the Energy threshold
    //    + You need to put the number of trigger conditions when
    //      you declarete the MMcThresholdCalc
    //    + If you don't put any dimension to MMcThresholdCalc it works
    //      like one dimension MMcThresholdCalc
    //
    MReadTree        read("Events;7", filename);
    MMcThresholdCalc calc(numtriggerconditions);

    tasklist.AddToList(&read);
    tasklist.AddToList(&calc);

    MEvtLoop evtloop;
    evtloop.SetParList(&parlist);

    //
    // Begin the loop (if the loop wasn't succesfull
    // don't try to draw the results
    //
    if (!evtloop.Eventloop())
        return;

    //
    // Now you can display the results
    //
    for (UInt_t i=0; i<numtriggerconditions; i++)
        ((*hists)[i])->Draw();
}