<commit_before>#Parts description
The HERA Part Number (hpn) is the alphanumeric primary key to track parts and connections.  Parts 
have ports that enable connections.  Port A is a skyward connection point and port B is further
from the sky.

HERA Part Numbers are unique identifiers.

In concept, a part is something that can break — the one exception is that the station is viewed as
a part in order to connect to a location.

Parts have an associated manufactures number (e.g. for antenna, it is the serial number).
Parts have a location.
'Z' is a reserved prefix for arbitrary hera part numbers we wish to track.
For now, all of the <int*> values correspond to the PAPER antenna number --
    ultimately, station/antenna hpn should be the same and rest will be serial numbers

Connections:  if there are equal connection points between ports A and B of a part, they connect
through by changing A->B (as opposed to the other case where there is one to multiple).  If this
changes, we will define an internal port-to-port wiring.

#Signal path summary:
STATION<ground:ground>A<focus:input>FDA<terminals:input>FEA<e,n:ea,na>CBL7F<eb,nb:a>RI<b:ea,na>RCVR<eb,nb:a>RO<b:a>CBLR<b:a>CBLC<b:input>DF

#Station Part:  station
The station “part” comprises the following sub-arrays:
HH[<int>] - refers to the HERA-19 hex number
PH[<int>] - refers to the PAPER elements in a mirrored hex.  PH<int_N> corresponds to the HH<int_N>
PI[<int>] - refers to the PAPER elements in the “imaging” configuration.
PP[A-G][<int>] - refers to the PAPER elements in the PAPER grid that are rotated 45deg
S[A-G][<int>] refers to the PAPER elements in the PAPER grid
There is a one-to-one correspondence to station_name and station_number (<int*>), which is the location
integer used in e.g. MIRIAD.
Port A:  sky
Port B:  ground<commit_msg>had file open...<commit_after>#Parts description
The HERA Part Number (hpn) is the alphanumeric primary key to track parts and connections.  Parts 
have ports that enable connections.  Port A is a skyward connection point and port B is further
from the sky.

HERA Part Numbers are unique identifiers.

In concept, a part is something that can break — the one exception is that the station is viewed as
a part in order to connect to a location.

Parts have an associated manufactures number (e.g. for antenna, it is the serial number).
Parts have a location.
'Z' is a reserved prefix for arbitrary hera part numbers we wish to track.
For now, all of the <int*> values correspond to the PAPER antenna number --
    ultimately, station/antenna hpn should be the same and rest will be serial numbers

Connections:  if there are equal connection points between ports A and B of a part, they connect
through by changing A->B (as opposed to the other case where there is one to multiple).  If this
changes, we will define an internal port-to-port wiring.

#Signal path summary:
STATION<ground:ground>A<focus:input>FDA<terminals:input>FEA<e,n:ea,na>C7F<eb,nb:a>RI<b:ea,na>RCVR<eb,nb:a>RO<b:a>CR<b:a>CC<b:input>DF

#Station Part:  station
The station “part” comprises the following sub-arrays:
HH[<int>] - refers to the HERA-19 hex number
PH[<int>] - refers to the PAPER elements in a mirrored hex.  PH<int_N> corresponds to the HH<int_N>
PI[<int>] - refers to the PAPER elements in the “imaging” configuration.
PP[A-G][<int>] - refers to the PAPER elements in the PAPER grid that are rotated 45deg
S[A-G][<int>] refers to the PAPER elements in the PAPER grid
There is a one-to-one correspondence to station_name and station_number (<int*>), which is the location
integer used in e.g. MIRIAD.
Port A:  sky
Port B:  ground
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