Table 1 Response surface test factor level coding table.

From: Optimisation of Goose oil extraction process by response surface methodology

Experimental factors

encodings

Level

−1

0

1

Ultrasonic power/W

A

450

550

650

Time/min

B

15

20

25

Material-liquid ratio (g: ml)

C

1:4

1:5

1:6

Temperature/°C

D

15

25

35

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