anchor.diff:    bool get summarize => _results['summarize'];
     bool get showQueries => _results['queries'];
     bool get onlyCustomers => _results['customers'];
  +  int get deltaDays =>
  +      int.parse(_results['delta'] == null ? '7' : _results['delta']);
     int get exitCode => _results == null
         ? -1
         : _results['help']
  
positive.code:     }
  
      // Skip to the next period
      current = current.add(Duration(days: 7));
    }
  }
  
negative.code:             ? 0
              : countWithOrWithoutCustomers(highPrioritizedIssuesClosed,
                  onlyCustomers: opts.onlyCustomers);
          meanUntilClosed[p] = meanComputerUntilClosed
              .meanDurationWithOrWithoutCustomers(highPrioritizedIssuesClosed,
                  onlyCustomers: opts.onlyCustomers);
          meanOpenClosed[p] = meanComputerOpenClosed
              .meanDurationWithOrWithoutCustomers(highPrioritizedIssuesOpened,
                  onlyCustomers: opts.onlyCustomers);
        });
        // Compute mean over all priorities
  
        var row = '${toStamp}';
        interestingPriorities.forEach((p) => row = '${row}\t${openCount[p]}');
        interestingPriorities.forEach((p) => row = '${row}\t${closeCount[p]}');
  