<｜begin▁of▁sentence｜>### Instruction:
As an aerospace engineer who designs and develops aircraft, spacecraft, or missiles, imagine you're tasked with analyzing the connectivity of a communication network among satellites in a satellite constellation. The network data is stored in a specialized format known as UCINET DL, which represents the connections between satellites. Your goal is to utilize a tool like igraph to read this UCINET DL file and calculate the diameter of the resulting graph. 

However, your primary tool for network analysis in Python is NetworkX, which doesn't directly support UCINET DL files. Instead, it offers functionality to read Pajek files (.net format). If provided with a Pajek file instead of UCINET DL, you would need to adapt your approach to read the network data while ensuring the same analysis objectives are met.
### Response:
import igraph as ig

# Read graph from UCINET DL file
g = ig.Graph.Read_DL('network_data.dl')

# Calculate the diameter of the graph
diameter = g.diameter()
print('Diameter of the graph:', diameter)
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