Time	NaOH	HCI	Mixture
0.0	20.6	21.5
0.5	20.6	21.4
1.0	20.7	21.4	34.7
1.5	20.7	21.4
2.0	20.7	21.4	34.7
2.5	20.6	21.3
3.0	20.7	21.3	34.6
3.5	20.7	21.3
4.0	20.7	21.2	34.5
4.5	20.7	21.2
5.0	20.7	21.1	34.2
5.5
6.0			34.1
6.5
7.0			33.9
7.5
8.0			33.7
8.5
9.0			33.4
9.5
10.0			33.0
10.5
11.0			32.8
11.5
12.0			32.6
12.5
13.0			32.6
13.5
14.0			32.5
14.5
15.0			32.1

The above is what I made. I couldn't figure out how to make them look like the example below picture. Please help me.

Chart Title 40 35 30 25 +111111111!!! 20 15 10 5 0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0 16.0 NaOH HCI Mixture Linear (NaOH) Linear (HCI) Linear (Mixture) Example Heat of reaction sample data 40.0 35.0 y=-0.3654x + 38.17 30.0 temperature 25.0 y = -0.15x + 25.575 20.0 y = 21.5 15.0 0.0 5.0 10.0 15.0 20.0 25.0 time, min