Correcciones residuales
(desconocidos pero acotables)
-->
Residual errors
(Unknown, but can be brought within known bounds)
OR
Residual errors
(Unknown, but can be shown to fall within known bounds)

In the telegraphic language of the Asker's presentation slide, we can't be sure which of those translations is most appropriate. Hopefully this will be clarified elsewhere in the document.

Background theory:
https://www.probabilitycourse.com/chapter6/6_2_0_probability...

"For example, suppose that you are an engineer and you design a communication system. Your company wants to ensure that the error probability in your system be less than a given value, say 10−5.

Calculating the exact value of probability might be difficult due to some unknown parameters or simply because the communication system is a complicated one. Here you do not actually need to find the error probability exactly, but all you need to do is to show that it is less than 10−5.

In this section, we will discuss several inequalities. Depending on the problem you are dealing with, you might decide which one to use."

In that quote, 'less than 10−5' is a bound (more specifically, a 'Union Bound', as explained in the next section of the quoted document).