[Isochrone]-Meaning some parameters in IsochroneResource

Open Source Routing Engine Isochrone
1

Hello everyone,
I am having trouble developing isochrone based on graphhopper
Some parameters in source isochrone I don’t understand,
Can you explain me these parameters
When I applied I compared it to graphhopper API and the region results received were very different

double limit;
if (weightLimit.get() > 0) {
limit = weightLimit.get();
shortestPathTree.setWeightLimit(limit + Math.max(limit * 0.14, 2_000));
} else if (distanceLimitInMeter.get() > 0) {
limit = distanceLimitInMeter.get();
shortestPathTree.setDistanceLimit(limit + Math.max(limit * 0.14, 2_000));
} else {
limit = timeLimitInSeconds.get() * 1000;
shortestPathTree.setTimeLimit(limit + Math.max(limit * 0.14, 200_000));
}
ArrayList zs = new ArrayList<>();
for (int i = 0; i < nBuckets.get(); i++) {
zs.add(limit / (nBuckets.get() - i));
}

How can i understand this line “Math.max(limit * 0.14, 200_000)” ?
what is “200_000”? Why is it that is not another value?

thank you,