Figure 3
The figure consists of a large central circular node labeled “Input layer”. Surrounding this central node are four smaller circular nodes arranged in a circular pattern and connected by thick curved lines. At the top is a circular node labeled “Regional Bunker Prices”. To the right is a circular node labeled “Maritime Economy Indicators”. At the bottom is a circular node labeled “Global Oil and Gas Sector Indicators”. To the left is a circular node labeled “Crude Oil Prices”. Four curved lines connect these outer nodes to form a continuous ring: one connects “Regional Bunker Prices” to “Maritme Economy Indicators”, another connects “Maritime Economy Indicators” to “Global Oil and Gas Sector Indicators”, a third connects “Global Oil and Gas Sector Indicators” to “Crude Oil Prices”, and the final line connects “Crude Oil Prices” back to “Regional Bunker Prices”.Input layer feature combination. Source: Authors