Size of dimension relating to file input being picked up as having different sizes on LHS & RHS of function

Hi NCL Talk

Can I ask for some help with the following error message-

When I run the script (attached along with summary of all variables in script) I get the following;

fatal:Dimension size mismatch on subscript #0, left-hand and right-hand side dimensions do not match

fatal:["Execute.c":7556]:Execute: Error occurred at or near line 207

Line 207 is

spell_tot_uk(:,nr,:,:) = dim_sum_n(cold_uk1(:,{spell(nr)},:,:,:),0)

The two variables it is picking up are given below but I can't see why they are being picked up as being different sizes as dimension #0 has a size of '20' for both. It relates to the number of files that have been inputted.

Variable: spell_tot_uk

Type: float

Total Size: 2592000 bytes

648000 values

Number of Dimensions: 4

Dimensions and sizes: [20] x [spell | 60] x [latitude | 18] x [longitude | 30]

Coordinates:

spell: [1..60]

latitude: [75..32.5]

longitude: [-27.5..45]

Number Of Attributes: 2

spell : 1

_FillValue : 9.96921e+36

Variable: cold_uk1

Type: integer

Total Size: 69984000 bytes

17496000 values

Number of Dimensions: 5

Dimensions and sizes: [ncl_join | 20] x [run_length | 180] x [number | 9] x [latitude | 18] x [longitude | 30]

Coordinates:

run_length: [1..180]

number: [0..8]

latitude: [75..32.5]

longitude: [-27.5..45]

Number Of Attributes: 2

cold_crit_values : 0

long_name : unique cold runs

Any help much appreciated

Kind regards

Dominique

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