Another way to look at this is to compare what Total paid for 40.1% of only PRL 15. Has somebody already done this?
From IOC.PR, original deal with Total buying 60.3% of PRL 15 below. I've included the whole table but, I'm choosing 9.9 to multiply by 66.67% (41.1 / 60.3. As you recall, that's what the revised - post OSH partnership - SPA did: pro-rated payments from original SPA.
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"Following the appraisal program, which is anticipated to be completed in 2015, the indicative payments based on the certified resource estimate are as follows:
Pricing Table US$0.77/mcfe..5.4 Tcfe = US$1.5 Billion
Pricing Table US$1.03/mcfe...6.5 Tcfe = US$2.1 B
GLJ Certified 2C...9.9Tcfe = US$4.1 B [[ x 2/3 = US$2.734 B ]]
GLJ Certified 3C...11.8 Tcfe = US$5.3 B"
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compare:
Deal with TOT. 9.9 T = 2.734 B
Deal with OSH. ". " = 3.117 B
TOT. 9.2 T = 2.540 B
OSH. ". ". = 2,903 B
= 383 M and 363 M difference, respectively.
Digging through MD&A's from 2013, 2014, 2015 I came up with our sunk costs which benefit OSH, For ease of reading all these figures, the numbers are in millions. All of this nitpicky detail will drive some people crazy. The bottom line is, well, at the bottom lines.
41.5M .....PRL15 Minority by out
.... = 41.5M
Seismic TBR: 18.9 + PRL15: 4.9 (( 0 known for Wahoo,Tuna, Mako etc. IOC wrote that did that entire PPL but, the figure was buried in an early "consolidated" MD&A )) One could add 5-15M, I suppose; I didn't.
....= 23.8
$178.4 Bobcat Raptor in 2014 + 9.8 Raptor sidetrack. 9 Bobcat in 2015
.....= 197.2
74.0 Triceratops-3. + 1.7 TTops-4 prep
....= 75.7
10.6 Pre-spud Antelope-4 + 39.5. A-4 STI
....= 50.1
3.4 Pre-spud Ant-5 + 17.6 A-5
..... = 21
22.6. Ant-5 + 10.6
....= 33.2
36.5. Wahoo in 2014 (( Again, I couldn't find the full numbers on this. Maestro Pet might know. 

)
.....= 36.5
Concept selection work with TOT
....= 13.7
10.7. Development survey, environmental, societal, labor relations.
....= 10.7
Adds up to:
******. ==. US$ 497.3 Million ******
But wait – there's more:
12.2 Expenditure (usage) drilling inventory
12.6 Rig moving
12.6 Field maintenance (of Wahoo capped well etc.)
..... = 37.4
****** == US$ 537.7 Million ******
I believe those totals are inaccurately low, easily by $25–100 M.
But let's subtract $400M for their IOC loan pay-off:
****** == US$ 137.7 – 237.7+Million ******
And then subtract $104.3M for TOT forgiveness of Antelope drilling costs. (Sorry. Almost forgot.)
******* == US$ 33.7 – 133.7+ Million *******
And last of all subtract 363 M for their net price above our TOT deal for a 9.2 T certification (we should be so lucky.)
******* == (~ US$ 230 M) *******
The field is de-risked (you're welcome.) FID is a virtual certainty. TBR is discovered and 3rd party certified at 2C 6.3 Tcfe, on our dime, (uh, I mean 200 grand) and likely supply 2 trains (you're welcome, again.) 40 prospects identified by advanced seismic across "all of our licenses" (I never could tease out that cost.) Total didn't have any of that.
So, all of THAT to say, OSH is offering ~ US$ 230 M more, for ALL of a new and improved InterOil, than TOT was to pay for 41% of PRL15.
All right, you numbers geeks, what did I miss? Be gentle.