capitalization - Question regarding capital letter in scientific report

I'm writing a scientific report (due this evening), and I'm having some problems regarding capital letters. As usual, figures, tables, sections, etc., are given capital letters.
Example:
Results given in Fig. 2.
See Tabs. 4-5.

In one of the tables I have defined 14 integrals, where each integral is paired up with a number. These integrals are referred to by:
Integrals 3-4 in Tab. 2.

My question is this. Should I capitalize the I in integral, when referring to them in the middle of a sentence?

Should I say: When testing with integral 4.
Or: When testing with Integral 4.

If the latter case, should I use an abbreviation for Integral, like I do for Figure (Fig.), Table (Tab.) and Section (Sec.)?