docs: def avgMultiplePlots(data, calc_mean=True, calc_std=False,
                       calc_density=False, nsample=None):
      """
      return the average (x,y) for a set of multiple x,y arrays
      which can have a different length and resolution
  
      data = ((xvals,yvals),(),,,)
      assumes that x values are sorted
      """
      xArr, yArr = bringPlotOverSameX(data, nsample)
      out = [xArr]
      if calc_mean:
          out.append(np.nanmean(yArr, axis=0))
      if calc_std:
          out.append(np.nanstd(yArr, axis=0))
      if calc_density:
          out.append(len(yArr) - np.isnan(yArr).sum(axis=0))
      return tuple(out)