code: public double getRelErr(final boolean upperBound, final boolean unioned,
        final int lgConfigK, final int numStdDev) {
      return RelativeErrorTables.getRelErr(upperBound, unioned, lgConfigK, numStdDev);
    }
docs: Gets the current (approximate) Relative Error (RE) asymptotic values given several
  parameters. This is used primarily for testing.
  @param upperBound return the RE for the Upper Bound, otherwise for the Lower Bound.
  @param unioned set true if the sketch is the result of a union operation.
  @param lgConfigK the configured value for the sketch.
  @param numStdDev the given number of Standard Deviations. This must be an integer between
  1 and 3, inclusive.
  <a href="{@docRoot}/resources/dictionary.html#numStdDev">Number of Standard Deviations</a>
  @return the current (approximate) RelativeError