A particle, plural particles, is a small word such as up, out or off that joins a verb to make one action: give up, find out, put off. A preposition (plural prepositions) is a small word such as at or of that joins a noun to the verb. On the page they look the same, and they follow different rules.
The test
Take a pronoun, it, as the object. After a verb and up, it goes in the middle: give it up. After a verb and at, it goes at the end: look at it. The place of the pronoun tells you which small word you have.
The lab runs this on 473 lines from the novel. It finds a verb and one of seven particles, and looks for a pronoun. 34 lines have the pronoun between, among them find it out, give it up and put it off. 8 have it after, and that gives 81.0% for the rule.
The 8 lines
81.0% looks like a rule with exceptions. Read the 8 and it is not. Five of them are a verb and a particle at the end of a clause, with the next clause starting with a pronoun: when we came away it was, let us sit down You are. The lab sees a pronoun after the particle, and the pronoun is not its object. The other three are get over it, twice, and glancing over it. There over is a preposition, and the pronoun follows it as the rule for prepositions says.
So the 34 are the whole story for a pronoun object. The play reads the same way. Its sample is smaller, 149 lines, with 16 between and 5 after, which is 76.2%. Of the 5, three begin a new clause, as sitting down You can does, and two follow a noun, a good influence over him and her hand over it, so again none puts the object after a particle.
The preposition side
The second list under the table holds the contrast: 347 lines in the novel with a verb, at, to, for, of or with, and a pronoun. Look at it, think of it, dance with him. Every one has the pronoun last. These lines were gathered that way, so the count says how common the pattern is. It does not say that no one could write it otherwise.
Which phrasal verbs are used
The novel's 473 lines are not 473 different verbs. Five make up a large share of them: go away 32, sit down 29, find out 20, come back 16 and give up 12, with set off also at 12 just behind it in the full table. The play's 149 lines lead with sit down 11, then go out 9, break off 8, pick up 7 and come up 5, with go over at 5 beside it. Sit down is in both lists.
What the lab cannot tell you is the meaning. Give up does not mean give and up, and the lab does not know that. It finds spellings. A few rows are not phrasal verbs at all, such as any great advantage over the country, where the word before over is a noun. You are looking at a count, and the table is there so that you can see where it is soft.