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There are no specific model for constant <math>PpO_2</math> dives. The difference lies in the fact that, at all times, the proportion of inert gas is calculated in relation to the chosen <math>PpO_2</math> (e.g. 0.75 ou 1.3 ata (bar)).
{| class="wikitable" style="width: 80%;"
|+Table of ZH-L 16 Half-times <math>t_{1/2}</math> with <math>a</math> and <math>b</math> values for nitrogen (N<sub>2</sub>) and helium (He).<ref name="Buhlmann-a-b-2002" />
! rowspan="3" |Cpt
! colspan="5" | ZH-L 16 <math>N_2</math>
! colspan="3" | ZH-L 16 A <math>He</math>
|-
! rowspan="2" |<math>t_{1/2}</math>
(min)
! A
Experimental
! B
Tables
! C
Computers
! rowspan="2" |<math>b</math>
! rowspan="2" | <math>t_{1/2}</math>
(min)
! rowspan="2" |<math>a</math>
! rowspan="2" |<math>b</math>
|-
! <math>a</math>
! <math>a</math>
! <math>a</math>
|-
| style="text-align: center;" | {{0}}1 (1a)
| {{0|00}}4
| style="text-align: center;" | 1.2599
| style="text-align: center;" | 1.2599
| style="text-align: center;" | 1.2599
| style="text-align: center;" | 0.5050
| style="text-align: center;" | {{0|00}}1.51
| style="text-align: center;" | 1.7424
| style="text-align: center;" | 0.4245
|-
| style="text-align: center;" | {{0}}1b
| {{0|00}}5
| style="text-align: center;" | 1.1696
| style="text-align: center;" | 1.1696
| style="text-align: center;" | 1.1696
| style="text-align: center;" | 0.5578
| style="text-align: center;" | {{0|00}}
|
|
|-
| style="text-align: center;" | {{0}}2
| {{0|00}}8
| style="text-align: center;" | 1.0000
| style="text-align: center;" | 1.0000
| style="text-align: center;" | 1.0000
| style="text-align: center;" | 0.6514
| style="text-align: center;" | {{0|00}}3.02
| style="text-align: center;" | 1.3830
| style="text-align: center;" | 0.5747
|-
| style="text-align: center;" | {{0}}3
| {{0}}12.5
| style="text-align: center;" | 0.8618
| style="text-align: center;" | 0.8618
| style="text-align: center;" | 0.8618
| style="text-align: center;" | 0.7222
| style="text-align: center;" | {{0|00}}4.72
| style="text-align: center;" | 1.1919
| style="text-align: center;" | 0.6527
|-
| style="text-align: center;" | {{0}}4
| {{0}}18.5
| style="text-align: center;" | 0.7562
| style="text-align: center;" | 0.7562
| style="text-align: center;" | 0.7562
| style="text-align: center;" | '''0.7825'''
| style="text-align: center;" | {{0|00}}6.99
| style="text-align: center;" | 1.0458
| style="text-align: center;" | 0.7223
|-
| style="text-align: center;" | {{0}}5
| {{0}}27
| style="text-align: center;" | 0.6667
| style="text-align: center;" | 0.6667
| style="text-align: center;" | '''0.6200'''
| style="text-align: center;" | '''0.8126'''
| style="text-align: center;" | {{0}}10.21
| style="text-align: center;" | 0.9220
| style="text-align: center;" | 0.7582
|-
| style="text-align: center;" | {{0}}6
| {{0}}38.3
| style="text-align: center;" | 0.5933
| style="text-align: center;" | '''0.5600'''
| style="text-align: center;" | '''0.5043'''
| style="text-align: center;" | 0.8434
| style="text-align: center;" | {{0}}14.48
| style="text-align: center;" | 0.8205
| style="text-align: center;" | 0.7957
|-
| style="text-align: center;" | {{0}}7
| {{0}}54.3
| style="text-align: center;" | 0.5282
| style="text-align: center;" | '''0.4947'''
| style="text-align: center;" | '''0.4410'''
| style="text-align: center;" | 0.8693
| style="text-align: center;" | {{0}}20.53
| style="text-align: center;" | 0.7305
| style="text-align: center;" | 0.8279
|-
| style="text-align: center;" | {{0}}8
| {{0}}77
| style="text-align: center;" | 0.4701
| style="text-align: center;" | '''0.4500'''
| style="text-align: center;" | '''0.4000'''
| style="text-align: center;" | 0.8910
| style="text-align: center;" | {{0}}29.11
| style="text-align: center;" | 0.6502
| style="text-align: center;" | 0.8553
|-
| style="text-align: center;" | {{0}}9
| 109
| style="text-align: center;" | 0.4187
| style="text-align: center;" | 0.4187
| style="text-align: center;" | '''0.3750'''
| style="text-align: center;" | 0.9092
| style="text-align: center;" | {{0}}41.2
| style="text-align: center;" | 0.5950
| style="text-align: center;" | 0.8757
|-
| style="text-align: center;" | 10
| 146
| style="text-align: center;" | 0.3798
| style="text-align: center;" | 0.3798
| style="text-align: center;" | '''0.3500'''
| style="text-align: center;" | 0.9222
| style="text-align: center;" | {{0}}55.19
| style="text-align: center;" | 0.5545
| style="text-align: center;" | 0.8903
|-
| style="text-align: center;" | 11
| 187
| style="text-align: center;" | 0.3497
| style="text-align: center;" | 0.3497
| style="text-align: center;" | '''0.3295'''
| style="text-align: center;" | 0.9319
| style="text-align: center;" | {{0}}70.69
| style="text-align: center;" | 0.5333
| style="text-align: center;" | 0.8997
|-
| style="text-align: center;" | 12
| 239
| style="text-align: center;" | 0.3223
| style="text-align: center;" | 0.3223
| style="text-align: center;" | '''0.3065'''
| style="text-align: center;" | 0.9403
| style="text-align: center;" | {{0}}90.34
| style="text-align: center;" | 0.5189
| style="text-align: center;" | 0.9073
|-
| style="text-align: center;" | 13
| 305
| style="text-align: center;" | 0.2971
| style="text-align: center;" | '''0.2850'''
| style="text-align: center;" | '''0.2835'''
| style="text-align: center;" | 0.9477
| style="text-align: center;" | 115.29
| style="text-align: center;" | 0.5181
| style="text-align: center;" | 0.9122
|-
| style="text-align: center;" | 14
| 390
| style="text-align: center;" | 0.2737
| style="text-align: center;" | 0.2737
| style="text-align: center;" | '''0.2610'''
| style="text-align: center;" | 0.9544
| style="text-align: center;" | 147.42
| style="text-align: center;" | 0.5176
| style="text-align: center;" | 0.9171
|-
| style="text-align: center;" | 15
| 498
| style="text-align: center;" | 0.2523
| style="text-align: center;" | 0.2523
| style="text-align: center;" | '''0.2480'''
| style="text-align: center;" | 0.9602
| style="text-align: center;" | 188.24
| style="text-align: center;" | 0.5172
| style="text-align: center;" | 0.9217
|-
| style="text-align: center;" | 16
| 635
| style="text-align: center;" | 0.2327
| style="text-align: center;" | 0.2327
| style="text-align: center;" | 0.2327
| style="text-align: center;" | 0.9653
| style="text-align: center;" | 240.03
| style="text-align: center;" | 0.5119
| style="text-align: center;" | 0.9267
|}
===Versions===
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