yeah that's what i thought but just trying to validate =)
I just found it kinda unnecessary for someone to put an OEI service ceiling graph to an introductory brochure about a helicopter, started thinking about it, and concluded to the most irrelevant question.
Thanks for the detailed answer, being an aerospace engineer, im kinda new to helicopters (never took a course about it) and still learning about the performance. And people in the forum answered every single one of the questions of mine with patience.
Thanks again =)