Is data coming from SEN0231 linear?

Hi team,

I have an SEN0231 formaldehyde sensor connected to a Raspberry Pi pico and it is reading UART communication from the module. For the code below, I am getting the following response. 
 

import time

from machine import UART, Pin

uart1 = machine.UART(1, baudrate=9600, tx=machine.Pin(4), rx=machine.Pin(5), timeout=1000)

while True:

    reading = uart1.read(10)

    if reading != None:

        print(uart1.read(10))

    time.sleep(0.01)

The response is as follows.

b'\xff\x17\x04\x00\x00\x11\x13\x889'
b'\xff\x17\x04\x00\x00\x11\x13\x889'
b'\xff\x17\x04\x00\x00\x11\x13\x889'

Can I know which part of this is the formaldehyde reading? Is it in ppm or mg/l? Also does it increase and decrease linearly with the formaldehyde concentration? I couldn't find this info in the documentation.