proc CheckExtResult {info ref_dist} {
  global ext_1
  if {[regexp "ext_1" $info]} {
    set dist [lindex [length ext_1] end]
    if { $dist > $ref_dist } {
      puts "Error: Extrema distance is too big"
    }
  } else {
    puts "Error: Extrema is not found"
  }
}