code: def multi_h1(cls, a_dict: Dict[str, Any], bins=None, **kwargs) -> "HistogramCollection":
          
          from physt.binnings import calculate_bins
          mega_values = np.concatenate(list(a_dict.values()))
          binning = calculate_bins(mega_values, bins, **kwargs)
  
          title = kwargs.pop("title", None)
          name = kwargs.pop("name", None)
  
          collection = HistogramCollection(binning=binning, title=title, name=name)
          for key, value in a_dict.items():
              collection.create(key, value)
          return collection
docs: Create a collection from multiple datasets.