Group Mechanics 13 (Source)

We changed the way group payouts for missions are calculated. When a mission is generated, the reward payout per member is calculated based on the current size of the group. If the group shrinks in size or group members are too far away to receive payout, those that do get paid receive the original per member reward. For example, if 3 players take a mission that pays 12k credits, each player will receive a maximum of 4k credits when the mission is completed. They receive 0 if they are out of range, and less if more people are added to the group to complete the mission