class RubyProf::FlameGraphPrinter

def print(output = STDOUT, title: "ruby-prof flame graph",

from AbstractPrinter.
Also accepts min_percent:, max_percent:, filter_by:, and sort_method:

title of the report.
title: - a String to override the default "ruby-prof flame graph"
Keyword arguments:

output - Any IO object, including STDOUT or a file.

Specify print options. 
def print(output = STDOUT, title: "ruby-prof flame graph",
          min_percent: 0, max_percent: 100, filter_by: :self_time, sort_method: nil, **)
  @min_percent = min_percent
  @max_percent = max_percent
  @filter_by = filter_by
  @sort_method = sort_method
  @title = title
  output << ERB.new(self.template).result(binding)
end